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Theorem sbthlemi10 6939
Description: Lemma for isbth 6940. (Contributed by NM, 28-Mar-1998.)
Hypotheses
Ref Expression
sbthlem.1  |-  A  e. 
_V
sbthlem.2  |-  D  =  { x  |  ( x  C_  A  /\  ( g " ( B  \  ( f "
x ) ) ) 
C_  ( A  \  x ) ) }
sbthlem.3  |-  H  =  ( ( f  |`  U. D )  u.  ( `' g  |`  ( A 
\  U. D ) ) )
sbthlem.4  |-  B  e. 
_V
Assertion
Ref Expression
sbthlemi10  |-  ( (EXMID  /\  ( A  ~<_  B  /\  B  ~<_  A ) )  ->  A  ~~  B
)
Distinct variable groups:    x, A    x, B    x, D    x, f,
g    x, H    f, g, A    B, f, g
Allowed substitution hints:    D( f, g)    H( f, g)

Proof of Theorem sbthlemi10
StepHypRef Expression
1 sbthlem.4 . . . . . 6  |-  B  e. 
_V
21brdom 6724 . . . . 5  |-  ( A  ~<_  B  <->  E. f  f : A -1-1-> B )
3 sbthlem.1 . . . . . 6  |-  A  e. 
_V
43brdom 6724 . . . . 5  |-  ( B  ~<_  A  <->  E. g  g : B -1-1-> A )
52, 4anbi12i 457 . . . 4  |-  ( ( A  ~<_  B  /\  B  ~<_  A )  <->  ( E. f  f : A -1-1-> B  /\  E. g  g : B -1-1-> A ) )
6 eeanv 1925 . . . 4  |-  ( E. f E. g ( f : A -1-1-> B  /\  g : B -1-1-> A
)  <->  ( E. f 
f : A -1-1-> B  /\  E. g  g : B -1-1-> A ) )
75, 6bitr4i 186 . . 3  |-  ( ( A  ~<_  B  /\  B  ~<_  A )  <->  E. f E. g ( f : A -1-1-> B  /\  g : B -1-1-> A ) )
8 sbthlem.3 . . . . . . 7  |-  H  =  ( ( f  |`  U. D )  u.  ( `' g  |`  ( A 
\  U. D ) ) )
9 vex 2733 . . . . . . . . 9  |-  f  e. 
_V
109resex 4930 . . . . . . . 8  |-  ( f  |`  U. D )  e. 
_V
11 vex 2733 . . . . . . . . . 10  |-  g  e. 
_V
1211cnvex 5147 . . . . . . . . 9  |-  `' g  e.  _V
1312resex 4930 . . . . . . . 8  |-  ( `' g  |`  ( A  \ 
U. D ) )  e.  _V
1410, 13unex 4424 . . . . . . 7  |-  ( ( f  |`  U. D )  u.  ( `' g  |`  ( A  \  U. D ) ) )  e.  _V
158, 14eqeltri 2243 . . . . . 6  |-  H  e. 
_V
16 sbthlem.2 . . . . . . 7  |-  D  =  { x  |  ( x  C_  A  /\  ( g " ( B  \  ( f "
x ) ) ) 
C_  ( A  \  x ) ) }
173, 16, 8sbthlemi9 6938 . . . . . 6  |-  ( (EXMID  /\  f : A -1-1-> B  /\  g : B -1-1-> A
)  ->  H : A
-1-1-onto-> B )
18 f1oen3g 6728 . . . . . 6  |-  ( ( H  e.  _V  /\  H : A -1-1-onto-> B )  ->  A  ~~  B )
1915, 17, 18sylancr 412 . . . . 5  |-  ( (EXMID  /\  f : A -1-1-> B  /\  g : B -1-1-> A
)  ->  A  ~~  B )
20193expib 1201 . . . 4  |-  (EXMID  ->  (
( f : A -1-1-> B  /\  g : B -1-1-> A )  ->  A  ~~  B ) )
2120exlimdvv 1890 . . 3  |-  (EXMID  ->  ( E. f E. g ( f : A -1-1-> B  /\  g : B -1-1-> A
)  ->  A  ~~  B ) )
227, 21syl5bi 151 . 2  |-  (EXMID  ->  (
( A  ~<_  B  /\  B  ~<_  A )  ->  A  ~~  B ) )
2322imp 123 1  |-  ( (EXMID  /\  ( A  ~<_  B  /\  B  ~<_  A ) )  ->  A  ~~  B
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    /\ w3a 973    = wceq 1348   E.wex 1485    e. wcel 2141   {cab 2156   _Vcvv 2730    \ cdif 3118    u. cun 3119    C_ wss 3121   U.cuni 3794   class class class wbr 3987  EXMIDwem 4178   `'ccnv 4608    |` cres 4611   "cima 4612   -1-1->wf1 5193   -1-1-onto->wf1o 5195    ~~ cen 6712    ~<_ cdom 6713
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4105  ax-nul 4113  ax-pow 4158  ax-pr 4192  ax-un 4416
This theorem depends on definitions:  df-bi 116  df-stab 826  df-dc 830  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-rab 2457  df-v 2732  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3566  df-sn 3587  df-pr 3588  df-op 3590  df-uni 3795  df-br 3988  df-opab 4049  df-exmid 4179  df-id 4276  df-xp 4615  df-rel 4616  df-cnv 4617  df-co 4618  df-dm 4619  df-rn 4620  df-res 4621  df-ima 4622  df-fun 5198  df-fn 5199  df-f 5200  df-f1 5201  df-fo 5202  df-f1o 5203  df-en 6715  df-dom 6716
This theorem is referenced by:  isbth  6940
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