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Theorem cdleme21at 30810
Description: Part of proof of Lemma E in [Crawley] p. 115. (Contributed by NM, 29-Nov-2012.)
Hypotheses
Ref Expression
cdleme21.l  |-  .<_  =  ( le `  K )
cdleme21.j  |-  .\/  =  ( join `  K )
cdleme21.m  |-  ./\  =  ( meet `  K )
cdleme21.a  |-  A  =  ( Atoms `  K )
cdleme21.h  |-  H  =  ( LHyp `  K
)
cdleme21.u  |-  U  =  ( ( P  .\/  Q )  ./\  W )
Assertion
Ref Expression
cdleme21at  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  T  =/=  z
)

Proof of Theorem cdleme21at
StepHypRef Expression
1 cdleme21.l . . . 4  |-  .<_  =  ( le `  K )
2 cdleme21.j . . . 4  |-  .\/  =  ( join `  K )
3 cdleme21.m . . . 4  |-  ./\  =  ( meet `  K )
4 cdleme21.a . . . 4  |-  A  =  ( Atoms `  K )
5 cdleme21.h . . . 4  |-  H  =  ( LHyp `  K
)
6 cdleme21.u . . . 4  |-  U  =  ( ( P  .\/  Q )  ./\  W )
71, 2, 3, 4, 5, 6cdleme21c 30809 . . 3  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( S  e.  A  /\  P  =/= 
Q  /\  -.  S  .<_  ( P  .\/  Q
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  -.  U  .<_  ( S  .\/  z ) )
873adant2r 1179 . 2  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  -.  U  .<_  ( S  .\/  z ) )
9 simp2r 984 . . . 4  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  U  .<_  ( S 
.\/  T ) )
10 oveq2 6048 . . . . 5  |-  ( T  =  z  ->  ( S  .\/  T )  =  ( S  .\/  z
) )
1110breq2d 4184 . . . 4  |-  ( T  =  z  ->  ( U  .<_  ( S  .\/  T )  <->  U  .<_  ( S 
.\/  z ) ) )
129, 11syl5ibcom 212 . . 3  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  ( T  =  z  ->  U  .<_  ( S  .\/  z ) ) )
1312necon3bd 2604 . 2  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  ( -.  U  .<_  ( S  .\/  z
)  ->  T  =/=  z ) )
148, 13mpd 15 1  |-  ( ( ( ( K  e.  HL  /\  W  e.  H )  /\  ( P  e.  A  /\  -.  P  .<_  W )  /\  Q  e.  A
)  /\  ( ( S  e.  A  /\  P  =/=  Q  /\  -.  S  .<_  ( P  .\/  Q ) )  /\  U  .<_  ( S  .\/  T
) )  /\  (
z  e.  A  /\  ( P  .\/  z )  =  ( S  .\/  z ) ) )  ->  T  =/=  z
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 359    /\ w3a 936    = wceq 1649    e. wcel 1721    =/= wne 2567   class class class wbr 4172   ` cfv 5413  (class class class)co 6040   lecple 13491   joincjn 14356   meetcmee 14357   Atomscatm 29746   HLchlt 29833   LHypclh 30466
This theorem is referenced by:  cdleme21e  30813
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-13 1723  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-rep 4280  ax-sep 4290  ax-nul 4298  ax-pow 4337  ax-pr 4363  ax-un 4660
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2258  df-mo 2259  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-ne 2569  df-nel 2570  df-ral 2671  df-rex 2672  df-reu 2673  df-rab 2675  df-v 2918  df-sbc 3122  df-csb 3212  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-nul 3589  df-if 3700  df-pw 3761  df-sn 3780  df-pr 3781  df-op 3783  df-uni 3976  df-iun 4055  df-br 4173  df-opab 4227  df-mpt 4228  df-id 4458  df-xp 4843  df-rel 4844  df-cnv 4845  df-co 4846  df-dm 4847  df-rn 4848  df-res 4849  df-ima 4850  df-iota 5377  df-fun 5415  df-fn 5416  df-f 5417  df-f1 5418  df-fo 5419  df-f1o 5420  df-fv 5421  df-ov 6043  df-oprab 6044  df-mpt2 6045  df-1st 6308  df-2nd 6309  df-undef 6502  df-riota 6508  df-poset 14358  df-plt 14370  df-lub 14386  df-glb 14387  df-join 14388  df-meet 14389  df-p0 14423  df-p1 14424  df-lat 14430  df-clat 14492  df-oposet 29659  df-ol 29661  df-oml 29662  df-covers 29749  df-ats 29750  df-atl 29781  df-cvlat 29805  df-hlat 29834  df-lhyp 30470
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