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Theorem List for Metamath Proof Explorer - 29801-29900   *Has distinct variable group(s)
TypeLabelDescription
Statement
 
Theoremcdleme36m 29801 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT (Contributed by NM, 11-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  V  =  ( ( t  .\/  E )  ./\  W )   &    |-  F  =  ( ( R  .\/  V )  ./\  ( E  .\/  ( ( t  .\/  R )  ./\  W )
 ) )   &    |-  C  =  ( ( S  .\/  V )  ./\  ( E  .\/  ( ( t  .\/  S )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  F  =  C ) 
 /\  ( ( t  e.  A  /\  -.  t  .<_  W )  /\  -.  t  .<_  ( P  .\/  Q ) ) ) ) 
 ->  R  =  S )
 
Theoremcdleme37m 29802 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT (Contributed by NM, 13-Mar-2013.)
 |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  D  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   &    |-  V  =  ( ( t  .\/  E )  ./\  W )   &    |-  X  =  ( ( u  .\/  D )  ./\  W )   &    |-  C  =  ( ( S  .\/  V )  ./\  ( E  .\/  ( ( t  .\/  S )  ./\  W )
 ) )   &    |-  G  =  ( ( S  .\/  X )  ./\  ( D  .\/  ( ( u  .\/  S )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )
 )  /\  ( (
 t  e.  A  /\  -.  t  .<_  W )  /\  -.  t  .<_  ( P  .\/  Q ) )  /\  (
 ( u  e.  A  /\  -.  u  .<_  W ) 
 /\  -.  u  .<_  ( P  .\/  Q )
 ) ) )  ->  C  =  G )
 
Theoremcdleme38m 29803 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT (Contributed by NM, 13-Mar-2013.)
 |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  D  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   &    |-  V  =  ( ( t  .\/  E )  ./\  W )   &    |-  X  =  ( ( u  .\/  D )  ./\  W )   &    |-  F  =  ( ( R  .\/  V )  ./\  ( E  .\/  ( ( t  .\/  R )  ./\  W )
 ) )   &    |-  G  =  ( ( S  .\/  X )  ./\  ( D  .\/  ( ( u  .\/  S )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  F  =  G ) 
 /\  ( ( t  e.  A  /\  -.  t  .<_  W )  /\  -.  t  .<_  ( P  .\/  Q ) )  /\  (
 ( u  e.  A  /\  -.  u  .<_  W ) 
 /\  -.  u  .<_  ( P  .\/  Q )
 ) ) )  ->  R  =  S )
 
Theoremcdleme38n 29804 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT TODO shorter if proved directly from cdleme36m 29801 and cdleme37m 29802? (Contributed by NM, 14-Mar-2013.)
 |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  D  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   &    |-  V  =  ( ( t  .\/  E )  ./\  W )   &    |-  X  =  ( ( u  .\/  D )  ./\  W )   &    |-  F  =  ( ( R  .\/  V )  ./\  ( E  .\/  ( ( t  .\/  R )  ./\  W )
 ) )   &    |-  G  =  ( ( S  .\/  X )  ./\  ( D  .\/  ( ( u  .\/  S )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) 
 /\  ( ( t  e.  A  /\  -.  t  .<_  W )  /\  -.  t  .<_  ( P  .\/  Q ) )  /\  (
 ( u  e.  A  /\  -.  u  .<_  W ) 
 /\  -.  u  .<_  ( P  .\/  Q )
 ) ) )  ->  F  =/=  G )
 
Theoremcdleme39a 29805 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT.  E,  Y,  G,  Z serve as f(t), f(u), ft( R), ft( S). Put hypotheses of cdleme38n 29804 in convention of cdleme32sn1awN 29772. TODO see if this hypothesis conversion would be better if done earlier. (Contributed by NM, 15-Mar-2013.)
 |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( R  .\/  t )  ./\  W ) ) )   &    |-  V  =  ( ( t  .\/  E )  ./\  W )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  P  e.  A  /\  Q  e.  A ) 
 /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  ( t  e.  A  /\  -.  t  .<_  W ) ) ) 
 ->  G  =  ( ( R  .\/  V )  ./\  ( E  .\/  (
 ( t  .\/  R )  ./\  W ) ) ) )
 
Theoremcdleme39n 29806 Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT.  E,  Y,  G,  Z serve as f(t), f(u), ft( R), ft( S). Put hypotheses of cdleme38n 29804 in convention of cdleme32sn1awN 29772. TODO see if this hypothesis conversion would be better if done earlier. (Contributed by NM, 15-Mar-2013.)
 |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( R  .\/  t )  ./\  W ) ) )   &    |-  Y  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   &    |-  Z  =  ( ( P  .\/  Q )  ./\  ( Y  .\/  ( ( S  .\/  u )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) 
 /\  ( ( t  e.  A  /\  -.  t  .<_  W )  /\  -.  t  .<_  ( P  .\/  Q ) )  /\  (
 ( u  e.  A  /\  -.  u  .<_  W ) 
 /\  -.  u  .<_  ( P  .\/  Q )
 ) ) )  ->  G  =/=  Z )
 
Theoremcdleme40m 29807* Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT Use proof idea from cdleme32sn1awN 29772. (Contributed by NM, 18-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  Y  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( R  .\/  t )  ./\ 
 W ) ) )   &    |-  C  =  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  Y ) )   &    |-  T  =  ( ( v  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  v )  ./\  W ) ) )   &    |-  F  =  ( ( P  .\/  Q )  ./\  ( T  .\/  ( ( S  .\/  v )  ./\  W ) ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) 
 /\  ( v  e.  A  /\  -.  v  .<_  W  /\  -.  v  .<_  ( P  .\/  Q ) ) ) ) 
 ->  [_ R  /  s ]_ N  =/=  F )
 
Theoremcdleme40n 29808* Part of proof of Lemma E in [Crawley] p. 113. Show that f(x) is one-to-one on  P  .\/  Q line. TODO: FIX COMMENT TODO get rid of '.<' class? (Contributed by NM, 18-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  Y  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( R  .\/  t )  ./\ 
 W ) ) )   &    |-  C  =  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  Y ) )   &    |-  T  =  ( ( v  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  v )  ./\  W ) ) )   &    |-  F  =  ( ( P  .\/  Q )  ./\  ( T  .\/  ( ( S  .\/  v )  ./\  W ) ) )   &    |-  X  =  ( ( P  .\/  Q )  ./\  ( T  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  O  =  (
 iota_ z  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( P  .\/  Q ) )  ->  z  =  X ) )   &    |-  V  =  if ( u  .<_  ( P  .\/  Q ) ,  O ,  .<  )   &    |-  Z  =  ( iota_ z  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( P  .\/  Q ) )  ->  z  =  F ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) ) 
 /\  ( P  =/=  Q 
 /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  ( R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) )  ->  [_ R  /  s ]_ N  =/=  [_ S  /  u ]_ V )
 
Theoremcdleme40v 29809* Part of proof of Lemma E in [Crawley] p. 113. Change bound variables in  [_ S  /  u ]_ V (but we use  [_ R  /  u ]_ V for convenience since we have its hypotheses available) . (Contributed by NM, 18-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  D  =  ( (
 s  .\/  U )  ./\  ( Q  .\/  (
 ( P  .\/  s
 )  ./\  W ) ) )   &    |-  Y  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   &    |-  T  =  ( ( v  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  v )  ./\  W ) ) )   &    |-  X  =  ( ( P  .\/  Q )  ./\  ( T  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  O  =  (
 iota_ z  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( P  .\/  Q ) )  ->  z  =  X ) )   &    |-  V  =  if ( u  .<_  ( P  .\/  Q ) ,  O ,  Y )   =>    |-  ( R  e.  A  -> 
 [_ R  /  s ]_ N  =  [_ R  /  u ]_ V )
 
Theoremcdleme40w 29810* Part of proof of Lemma E in [Crawley] p. 113. Apply cdleme40v 29809 bound variable change to  [_ S  /  u ]_ V. TODO: FIX COMMENT (Contributed by NM, 19-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  D  =  ( (
 s  .\/  U )  ./\  ( Q  .\/  (
 ( P  .\/  s
 )  ./\  W ) ) )   &    |-  Y  =  ( ( u  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  u )  ./\  W )
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  S  .<_  ( P 
 .\/  Q )  /\  R  =/=  S ) )  ->  [_ R  /  s ]_ N  =/=  [_ S  /  s ]_ N )
 
Theoremcdleme42a 29811 Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 3-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( K  e.  HL  /\  W  e.  H )  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 ->  ( R  .\/  S )  =  ( R  .\/  V ) )
 
Theoremcdleme42c 29812 Part of proof of Lemma E in [Crawley] p. 113. Match  -.  x  .<_  W. (Contributed by NM, 6-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( K  e.  HL  /\  W  e.  H )  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 ->  -.  ( R  .\/  V )  .<_  W )
 
Theoremcdleme42d 29813 Part of proof of Lemma E in [Crawley] p. 113. Match  ( s  .\/  ( x  ./\  W
) )  =  x. (Contributed by NM, 6-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( K  e.  HL  /\  W  e.  H )  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 ->  ( R  .\/  (
 ( R  .\/  V )  ./\  W ) )  =  ( R  .\/  V ) )
 
Theoremcdleme41sn3aw 29814* Part of proof of Lemma E in [Crawley] p. 113. Show that f(r) is different on and off the  P  .\/  Q line. TODO: FIX COMMENT (Contributed by NM, 18-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  -.  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) )  ->  [_ R  /  s ]_ N  =/=  [_ S  /  s ]_ N )
 
Theoremcdleme41sn4aw 29815* Part of proof of Lemma E in [Crawley] p. 113. Show that f(r) is for on and off  P  .\/  Q line. TODO: FIX COMMENT (Contributed by NM, 19-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( -.  R  .<_  ( P  .\/  Q )  /\  S  .<_  ( P  .\/  Q )  /\  R  =/=  S ) )  ->  [_ R  /  s ]_ N  =/=  [_ S  /  s ]_ N )
 
Theoremcdleme41snaw 29816* Part of proof of Lemma E in [Crawley] p. 113. Show that f(r) is for combined cases; compare cdleme32snaw 29775. TODO: FIX COMMENT (Contributed by NM, 18-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  R  =/=  S )  ->  [_ R  /  s ]_ N  =/=  [_ S  /  s ]_ N )
 
Theoremcdleme41fva11 29817* Part of proof of Lemma E in [Crawley] p. 113. Show that f(r) is one-to-one for r in W (r an atom not under w). TODO: FIX COMMENT (Contributed by NM, 19-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) ) 
 /\  ( P  =/=  Q 
 /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  R  =/=  S )  ->  ( F `  R )  =/=  ( F `  S ) )
 
Theoremcdleme42b 29818* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 6-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) ) 
 /\  ( X  e.  B  /\  ( P  =/=  Q 
 /\  -.  X  .<_  W ) )  /\  (
 ( R  e.  A  /\  -.  R  .<_  W ) 
 /\  ( R  .\/  ( X  ./\  W ) )  =  X ) )  ->  ( F `  X )  =  (
 [_ R  /  s ]_ N  .\/  ( X 
 ./\  W ) ) )
 
Theoremcdleme42e 29819* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 8-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  P  =/=  Q )  ->  ( F `  ( R  .\/  V ) )  =  ( [_ R  /  s ]_ N  .\/  ( ( R  .\/  V )  ./\ 
 W ) ) )
 
Theoremcdleme42f 29820* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 8-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  P  =/=  Q )  ->  ( F `  ( R  .\/  V ) )  =  (
 ( F `  R )  .\/  V ) )
 
Theoremcdleme42g 29821* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 8-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  P  =/=  Q )  ->  ( F `  ( R  .\/  S ) )  =  (
 ( F `  R )  .\/  V ) )
 
Theoremcdleme42h 29822* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 8-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  P  =/=  Q )  ->  ( F `  S )  .<_  ( ( F `  R ) 
 .\/  V ) )
 
Theoremcdleme42i 29823* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 8-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  P  =/=  Q )  ->  ( ( F `  R )  .\/  ( F `  S ) )  .<_  ( ( F `
  R )  .\/  V ) )
 
Theoremcdleme42k 29824* Part of proof of Lemma E in [Crawley] p. 113. Since F ' S =/= F'R when S =/= R (i.e. 1-1); then ( ( F ' R ) .\/ ( F ' S ) ) is 2-dim therefore = ( ( F ' R ) .\/ V ) by cdleme42i 29823 and ps-1 28817 TODO: FIX COMMENT (Contributed by NM, 20-Mar-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  R  =/=  S )  ->  ( ( F `  R )  .\/  ( F `  S ) )  =  ( ( F `  R ) 
 .\/  V ) )
 
Theoremcdleme42ke 29825* Part of proof of Lemma E in [Crawley] p. 113. Remove  R  =/=  S condition. TODO: FIX COMMENT (Contributed by NM, 2-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) )  ->  (
 ( F `  R )  .\/  ( F `  S ) )  =  ( ( F `  R )  .\/  V ) )
 
Theoremcdleme42keg 29826* Part of proof of Lemma E in [Crawley] p. 113. Remove  P  =/=  Q condition. TODO: FIX COMMENT TODO: Use instead of cdleme42ke 29825 and even combine with it? (Contributed by NM, 22-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   &    |-  V  =  ( ( R  .\/  S )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) )  ->  (
 ( F `  R )  .\/  ( F `  S ) )  =  ( ( F `  R )  .\/  V ) )
 
Theoremcdleme42mN 29827* Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT . f preserves join: f(r  \/ s) = f(r)  \/ s, p. 115 10th line from bottom. (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) ) 
 /\  ( P  =/=  Q 
 /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) )  ->  ( F `  ( R  .\/  S ) )  =  (
 ( F `  R )  .\/  ( F `  S ) ) )
 
Theoremcdleme42mgN 29828* Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT . f preserves join: f(r  \/ s) = f(r)  \/ s, p. 115 10th line from bottom. TODO: Use instead of cdleme42mN 29827? Combine with cdleme42mN 29827? (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( s  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  s )  ./\  W ) ) )   &    |-  E  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  G  =  ( ( P  .\/  Q )  ./\  ( E  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  I  =  (
 iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  G ) )   &    |-  N  =  if ( s  .<_  ( P  .\/  Q ) ,  I ,  D )   &    |-  O  =  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( N  .\/  ( x  ./\  W ) ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  O ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H ) 
 /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) ) 
 /\  ( ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) )  ->  ( F `  ( R  .\/  S ) )  =  ( ( F `  R )  .\/  ( F `  S ) ) )
 
Theoremcdleme43aN 29829 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT p. 115 penultimate line: g(f(r)) = (p v q) ^ (g(s) v v1) (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  X  =  ( ( Q  .\/  P )  ./\  W )   &    |-  C  =  ( ( S  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  S )  ./\  W )
 ) )   &    |-  Z  =  ( ( P  .\/  Q )  ./\  ( C  .\/  ( ( R  .\/  S )  ./\  W )
 ) )   &    |-  D  =  ( ( S  .\/  X )  ./\  ( P  .\/  ( ( Q  .\/  S )  ./\  W )
 ) )   &    |-  G  =  ( ( Q  .\/  P )  ./\  ( D  .\/  ( ( Z  .\/  S )  ./\  W )
 ) )   &    |-  E  =  ( ( D  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  D )  ./\  W )
 ) )   &    |-  V  =  ( ( Z  .\/  S )  ./\  W )   &    |-  Y  =  ( ( R  .\/  D )  ./\  W )   =>    |-  (
 ( K  e.  HL  /\  P  e.  A  /\  Q  e.  A )  ->  G  =  ( ( P  .\/  Q )  ./\  ( D  .\/  V ) ) )
 
Theoremcdleme43bN 29830 Lemma for Lemma E in [Crawley] p. 113. g(s) is an atom not under w. (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  X  =  ( ( Q  .\/  P )  ./\  W )   &    |-  C  =  ( ( S  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  S )  ./\  W )
 ) )   &    |-  Z  =  ( ( P  .\/  Q )  ./\  ( C  .\/  ( ( R  .\/  S )  ./\  W )
 ) )   &    |-  D  =  ( ( S  .\/  X )  ./\  ( P  .\/  ( ( Q  .\/  S )  ./\  W )
 ) )   &    |-  G  =  ( ( Q  .\/  P )  ./\  ( D  .\/  ( ( Z  .\/  S )  ./\  W )
 ) )   &    |-  E  =  ( ( D  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  D )  ./\  W )
 ) )   &    |-  V  =  ( ( Z  .\/  S )  ./\  W )   &    |-  Y  =  ( ( R  .\/  D )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  ( D  e.  A  /\  -.  D  .<_  W ) )
 
Theoremcdleme43cN 29831 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT p. 115 last line: r v g(s) = r v v2 (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  X  =  ( ( Q  .\/  P )  ./\  W )   &    |-  C  =  ( ( S  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  S )  ./\  W )
 ) )   &    |-  Z  =  ( ( P  .\/  Q )  ./\  ( C  .\/  ( ( R  .\/  S )  ./\  W )
 ) )   &    |-  D  =  ( ( S  .\/  X )  ./\  ( P  .\/  ( ( Q  .\/  S )  ./\  W )
 ) )   &    |-  G  =  ( ( Q  .\/  P )  ./\  ( D  .\/  ( ( Z  .\/  S )  ./\  W )
 ) )   &    |-  E  =  ( ( D  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  D )  ./\  W )
 ) )   &    |-  V  =  ( ( Z  .\/  S )  ./\  W )   &    |-  Y  =  ( ( R  .\/  D )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  -.  S  .<_  ( P  .\/  Q ) )  ->  ( R 
 .\/  D )  =  ( R  .\/  Y )
 )
 
Theoremcdleme43dN 29832 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT p. 116 2nd line: f(r) v s = f(r) v f(g(s)) (Contributed by NM, 20-Mar-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  X  =  ( ( Q  .\/  P )  ./\  W )   &    |-  C  =  ( ( S  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  S )  ./\  W )
 ) )   &    |-  Z  =  ( ( P  .\/  Q )  ./\  ( C  .\/  ( ( R  .\/  S )  ./\  W )
 ) )   &    |-  D  =  ( ( S  .\/  X )  ./\  ( P  .\/  ( ( Q  .\/  S )  ./\  W )
 ) )   &    |-  G  =  ( ( Q  .\/  P )  ./\  ( D  .\/  ( ( Z  .\/  S )  ./\  W )
 ) )   &    |-  E  =  ( ( D  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  D )  ./\  W )
 ) )   &    |-  V  =  ( ( Z  .\/  S )  ./\  W )   &    |-  Y  =  ( ( R  .\/  D )  ./\  W )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  -.  S  .<_  ( P  .\/  Q )
 ) )  ->  ( Z  .\/  S )  =  ( Z  .\/  E ) )
 
Theoremcdleme46f2g2 29833 Conversion for  G to reuse  F theorems. TODO FIX COMMENT TODO What other conversion theorems would be reused? e.g. cdlemeg46nlpq 29857? Find other hlatjcom 28708 uses giving  Q 
.\/  P. (Contributed by NM, 1-Apr-2013.)
 |-  .\/  =  ( join `  K )   &    |-  A  =  ( Atoms `  K )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  ( (
 ( K  e.  HL  /\  W  e.  H ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W )  /\  ( P  e.  A  /\  -.  P  .<_  W ) ) 
 /\  ( Q  =/=  P 
 /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  -.  S  .<_  ( Q  .\/  P ) ) )
 
Theoremcdleme46f2g1 29834 Conversion for  G to reuse  F theorems. TODO FIX COMMENT (Contributed by NM, 1-Apr-2013.)
 |-  .\/  =  ( join `  K )   &    |-  A  =  ( Atoms `  K )   =>    |-  (
 ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  -.  S  .<_  ( P  .\/  Q )
 ) )  ->  (
 ( ( K  e.  HL  /\  W  e.  H )  /\  ( Q  e.  A  /\  -.  Q  .<_  W )  /\  ( P  e.  A  /\  -.  P  .<_  W ) ) 
 /\  ( Q  =/=  P 
 /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  ( R  .<_  ( Q  .\/  P )  /\  -.  S  .<_  ( Q 
 .\/  P ) ) ) )
 
Theoremcdleme17d2 29835* Part of proof of Lemma E in [Crawley] p. 114, first part of 4th paragraph.  F,  G represent f(s), fs(p) respectively. We show, in their notation, fs(p)=q. TODO FIX COMMENT (Contributed by NM, 5-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  ( F `  P )  =  Q )
 
Theoremcdleme17d3 29836* TODO FIX COMMENT (Contributed by NM, 5-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  P  =/=  Q )  ->  ( F `  P )  =  Q )
 
Theoremcdleme17d4 29837* TODO FIX COMMENT (Contributed by NM, 11-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  P  =  Q )  ->  ( F `  P )  =  Q )
 
Theoremcdleme17d 29838* Part of proof of Lemma E in [Crawley] p. 114, first part of 4th paragraph. We show, in their notation, fs(p)=q. TODO FIX COMMENT (Contributed by NM, 11-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  ->  ( F `  P )  =  Q )
 
Theoremcdleme48fv 29839* Part of proof of Lemma D in [Crawley] p. 113. TODO: Can this replace uses of cdleme32a 29781? TODO: Can this be used to help prove the  R or  S case where  X is an atom? (Contributed by NM, 8-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( X  e.  B  /\  -.  X  .<_  W ) ) 
 /\  ( ( S  e.  A  /\  -.  S  .<_  W )  /\  ( S  .\/  ( X 
 ./\  W ) )  =  X ) )  ->  ( F `  X )  =  ( ( F `
  S )  .\/  ( X  ./\  W ) ) )
 
Theoremcdleme48fvg 29840* Remove  P  =/=  Q condition in cdleme48fv 29839. TODO: Can this replace uses of cdleme32a 29781? TODO: Can this be used to help prove the  R or  S case where  X is an atom? TODO: Can this be proved more directly by eliminating  P  =/=  Q in earlier theorems? Should this replace uses of cdleme48fv 29839? (Contributed by NM, 23-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( X  e.  B  /\  -.  X  .<_  W )  /\  ( ( S  e.  A  /\  -.  S  .<_  W )  /\  ( S 
 .\/  ( X  ./\  W ) )  =  X ) )  ->  ( F `
  X )  =  ( ( F `  S )  .\/  ( X 
 ./\  W ) ) )
 
Theoremcdleme46fvaw 29841* Show that  ( F `  R ) is an atom not under  W when  R is an atom not under  W. (Contributed by NM, 18-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( R  e.  A  /\  -.  R  .<_  W ) ) 
 ->  ( ( F `  R )  e.  A  /\  -.  ( F `  R )  .<_  W ) )
 
Theoremcdleme48bw 29842* TODO: fix comment. TODO: Remove unnecessary  P  =/=  Q from cdleme48bw 29842 cdlemeg46c 29853 cdlemeg46fvaw 29856 cdlemeg46rgv 29868 cdlemeg46gfv 29870? cdleme48d 29875? and possibly others they affect. (Contributed by NM, 9-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( X  e.  B  /\  -.  X  .<_  W ) ) 
 /\  ( ( S  e.  A  /\  -.  S  .<_  W )  /\  ( S  .\/  ( X 
 ./\  W ) )  =  X ) )  ->  -.  ( F `  X )  .<_  W )
 
Theoremcdleme48b 29843* TODO: fix comment. (Contributed by NM, 8-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( X  e.  B  /\  -.  X  .<_  W ) ) 
 /\  ( ( S  e.  A  /\  -.  S  .<_  W )  /\  ( S  .\/  ( X 
 ./\  W ) )  =  X ) )  ->  ( ( F `  X )  ./\  W )  =  ( X  ./\  W ) )
 
Theoremcdleme46frvlpq 29844* Show that  ( F `  S ) is not under  P  .\/  Q when  S isn't. (Contributed by NM, 1-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  -.  ( F `  S )  .<_  ( P  .\/  Q )
 )
 
Theoremcdleme46fsvlpq 29845* Show that  ( F `  R ) is under  P  .\/  Q when  R is. (Contributed by NM, 1-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W ) ) 
 /\  R  .<_  ( P 
 .\/  Q ) )  ->  ( F `  R ) 
 .<_  ( P  .\/  Q ) )
 
Theoremcdlemeg46fvcl 29846* TODO: fix comment. (Contributed by NM, 9-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  X  e.  B )  ->  ( G `  X )  e.  B )
 
Theoremcdleme4gfv 29847* Part of proof of Lemma D in [Crawley] p. 113. TODO: Can this replace uses of cdleme32a 29781? TODO: Can this be used to help prove the  R or  S case where  X is an atom? TODO: Would an antecedent transformer like cdleme46f2g2 29833 help? (Contributed by NM, 8-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( X  e.  B  /\  -.  X  .<_  W ) ) 
 /\  ( ( S  e.  A  /\  -.  S  .<_  W )  /\  ( S  .\/  ( X 
 ./\  W ) )  =  X ) )  ->  ( G `  X )  =  ( ( G `
  S )  .\/  ( X  ./\  W ) ) )
 
Theoremcdlemeg47b 29848* TODO FIX COMMENT (Contributed by NM, 1-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  ( G `  S )  =  [_ S  /  v ]_ N )
 
Theoremcdlemeg47rv 29849* Value of gs(r) when r is an atom under pq and s is any atom not under pq, using very compact hypotheses. TODO FIX COMMENT (Contributed by NM, 3-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  -.  S  .<_  ( P  .\/  Q )
 ) )  ->  ( G `  R )  = 
 [_ R  /  u ]_
 [_ S  /  v ]_ O )
 
Theoremcdlemeg47rv2 29850* Value of gs(r) when r is an atom under pq and s is any atom not under pq, using very compact hypotheses. TODO FIX COMMENT (Contributed by NM, 1-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( R  e.  A  /\  -.  R  .<_  W )  /\  ( S  e.  A  /\  -.  S  .<_  W ) )  /\  ( R 
 .<_  ( P  .\/  Q )  /\  -.  S  .<_  ( P  .\/  Q )
 ) )  ->  ( G `  R )  =  ( ( Q  .\/  P )  ./\  ( ( G `  S )  .\/  ( ( R  .\/  S )  ./\  W )
 ) ) )
 
Theoremcdlemeg49le 29851* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 9-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( X  e.  B  /\  Y  e.  B )  /\  X  .<_  Y )  ->  ( G `  X ) 
 .<_  ( G `  Y ) )
 
Theoremcdlemeg46bOLDN 29852* TODO FIX COMMENT (Contributed by NM, 1-Apr-2013.) (New usage is discouraged.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /  t ]_ D )  .\/  ( x  ./\  W ) ) ) ) ,  x ) )   &    |-  V  =  ( ( Q  .\/  P )  ./\  W )   &    |-  N  =  ( ( v  .\/  V )  ./\  ( P  .\/  ( ( Q  .\/  v )  ./\  W ) ) )   &    |-  O  =  ( ( Q  .\/  P )  ./\  ( N  .\/  ( ( u  .\/  v )  ./\  W ) ) )   &    |-  G  =  ( a  e.  B  |->  if ( ( Q  =/=  P 
 /\  -.  a  .<_  W ) ,  ( iota_ c  e.  B A. u  e.  A  ( ( -.  u  .<_  W  /\  ( u  .\/  ( a  ./\  W ) )  =  a )  ->  c  =  ( if ( u  .<_  ( Q  .\/  P ) ,  ( iota_ b  e.  B A. v  e.  A  ( ( -.  v  .<_  W  /\  -.  v  .<_  ( Q  .\/  P ) )  ->  b  =  O ) ) , 
 [_ u  /  v ]_ N )  .\/  (
 a  ./\  W ) ) ) ) ,  a
 ) )   =>    |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W ) 
 /\  ( Q  e.  A  /\  -.  Q  .<_  W ) )  /\  ( P  =/=  Q  /\  ( S  e.  A  /\  -.  S  .<_  W ) ) 
 /\  -.  S  .<_  ( P  .\/  Q )
 )  ->  ( G `  S )  =  [_ S  /  v ]_ N )
 
Theoremcdlemeg46c 29853* TODO FIX COMMENT (Contributed by NM, 1-Apr-2013.)
 |-  B  =  ( Base `  K )   &    |-  .<_  =  ( le `  K )   &    |- 
 .\/  =  ( join `  K )   &    |-  ./\  =  ( meet `  K )   &    |-  A  =  ( Atoms `  K )   &    |-  H  =  ( LHyp `  K )   &    |-  U  =  ( ( P  .\/  Q )  ./\  W )   &    |-  D  =  ( ( t  .\/  U )  ./\  ( Q  .\/  ( ( P  .\/  t )  ./\  W ) ) )   &    |-  E  =  ( ( P  .\/  Q )  ./\  ( D  .\/  ( ( s  .\/  t )  ./\  W ) ) )   &    |-  F  =  ( x  e.  B  |->  if ( ( P  =/=  Q 
 /\  -.  x  .<_  W ) ,  ( iota_ z  e.  B A. s  e.  A  ( ( -.  s  .<_  W  /\  (
 s  .\/  ( x  ./\ 
 W ) )  =  x )  ->  z  =  ( if ( s 
 .<_  ( P  .\/  Q ) ,  ( iota_ y  e.  B A. t  e.  A  ( ( -.  t  .<_  W  /\  -.  t  .<_  ( P  .\/  Q ) )  ->  y  =  E ) ) , 
 [_ s  /