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Theorem omp1eomlem 6931
Description: Lemma for omp1eom 6932. (Contributed by Jim Kingdon, 11-Jul-2023.)
Hypotheses
Ref Expression
omp1eom.f  |-  F  =  ( x  e.  om  |->  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) )
omp1eom.s  |-  S  =  ( x  e.  om  |->  suc  x )
omp1eom.g  |-  G  = case ( S ,  (  _I  |`  1o )
)
Assertion
Ref Expression
omp1eomlem  |-  F : om
-1-1-onto-> ( om 1o )
Distinct variable group:    x, G
Allowed substitution hints:    S( x)    F( x)

Proof of Theorem omp1eomlem
Dummy variables  z  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 omp1eom.f . . 3  |-  F  =  ( x  e.  om  |->  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) )
2 el1o 6288 . . . . . . 7  |-  ( x  e.  1o  <->  x  =  (/) )
32biimpri 132 . . . . . 6  |-  ( x  =  (/)  ->  x  e.  1o )
43adantl 273 . . . . 5  |-  ( ( ( T.  /\  x  e.  om )  /\  x  =  (/) )  ->  x  e.  1o )
5 djurcl 6889 . . . . 5  |-  ( x  e.  1o  ->  (inr `  x )  e.  ( om 1o ) )
64, 5syl 14 . . . 4  |-  ( ( ( T.  /\  x  e.  om )  /\  x  =  (/) )  ->  (inr `  x )  e.  ( om 1o ) )
7 nnpredcl 4496 . . . . . 6  |-  ( x  e.  om  ->  U. x  e.  om )
87ad2antlr 478 . . . . 5  |-  ( ( ( T.  /\  x  e.  om )  /\  -.  x  =  (/) )  ->  U. x  e.  om )
9 djulcl 6888 . . . . 5  |-  ( U. x  e.  om  ->  (inl
`  U. x )  e.  ( om 1o ) )
108, 9syl 14 . . . 4  |-  ( ( ( T.  /\  x  e.  om )  /\  -.  x  =  (/) )  -> 
(inl `  U. x )  e.  ( om 1o ) )
11 nndceq0 4491 . . . . 5  |-  ( x  e.  om  -> DECID  x  =  (/) )
1211adantl 273 . . . 4  |-  ( ( T.  /\  x  e. 
om )  -> DECID  x  =  (/) )
136, 10, 12ifcldadc 3467 . . 3  |-  ( ( T.  /\  x  e. 
om )  ->  if ( x  =  (/) ,  (inr
`  x ) ,  (inl `  U. x ) )  e.  ( om 1o ) )
14 omp1eom.s . . . . . . . 8  |-  S  =  ( x  e.  om  |->  suc  x )
15 peano2 4469 . . . . . . . 8  |-  ( x  e.  om  ->  suc  x  e.  om )
1614, 15fmpti 5526 . . . . . . 7  |-  S : om
--> om
1716a1i 9 . . . . . 6  |-  ( T. 
->  S : om --> om )
18 f1oi 5361 . . . . . . . . 9  |-  (  _I  |`  1o ) : 1o -1-1-onto-> 1o
19 f1of 5323 . . . . . . . . 9  |-  ( (  _I  |`  1o ) : 1o -1-1-onto-> 1o  ->  (  _I  |`  1o ) : 1o --> 1o )
2018, 19ax-mp 7 . . . . . . . 8  |-  (  _I  |`  1o ) : 1o --> 1o
21 1onn 6370 . . . . . . . . 9  |-  1o  e.  om
22 omelon 4482 . . . . . . . . . 10  |-  om  e.  On
2322onelssi 4311 . . . . . . . . 9  |-  ( 1o  e.  om  ->  1o  C_ 
om )
2421, 23ax-mp 7 . . . . . . . 8  |-  1o  C_  om
25 fss 5242 . . . . . . . 8  |-  ( ( (  _I  |`  1o ) : 1o --> 1o  /\  1o  C_  om )  -> 
(  _I  |`  1o ) : 1o --> om )
2620, 24, 25mp2an 420 . . . . . . 7  |-  (  _I  |`  1o ) : 1o --> om
2726a1i 9 . . . . . 6  |-  ( T. 
->  (  _I  |`  1o ) : 1o --> om )
2817, 27casef 6925 . . . . 5  |-  ( T. 
-> case ( S ,  (  _I  |`  1o )
) : ( om 1o ) --> om )
29 omp1eom.g . . . . . 6  |-  G  = case ( S ,  (  _I  |`  1o )
)
3029feq1i 5223 . . . . 5  |-  ( G : ( om 1o ) --> om  <-> case ( S ,  (  _I  |`  1o )
) : ( om 1o ) --> om )
3128, 30sylibr 133 . . . 4  |-  ( T. 
->  G : ( om 1o ) --> om )
3231ffvelrnda 5509 . . 3  |-  ( ( T.  /\  y  e.  ( om 1o ) )  ->  ( G `  y )  e.  om )
33 ffn 5230 . . . . . . . . . . . . . . . 16  |-  ( S : om --> om  ->  S  Fn  om )
3416, 33mp1i 10 . . . . . . . . . . . . . . 15  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  S  Fn  om )
35 ffun 5233 . . . . . . . . . . . . . . . 16  |-  ( (  _I  |`  1o ) : 1o --> 1o  ->  Fun  (  _I  |`  1o ) )
3620, 35mp1i 10 . . . . . . . . . . . . . . 15  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  Fun  (  _I  |`  1o ) )
37 simpl 108 . . . . . . . . . . . . . . 15  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  z  e.  om )
3834, 36, 37caseinl 6928 . . . . . . . . . . . . . 14  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  (case ( S ,  (  _I  |`  1o ) ) `  (inl `  z ) )  =  ( S `  z ) )
3929eqcomi 2119 . . . . . . . . . . . . . . . 16  |- case ( S ,  (  _I  |`  1o ) )  =  G
4039a1i 9 . . . . . . . . . . . . . . 15  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  -> case ( S ,  (  _I  |`  1o ) )  =  G )
41 simpr 109 . . . . . . . . . . . . . . . 16  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  y  =  (inl `  z )
)
4241eqcomd 2120 . . . . . . . . . . . . . . 15  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  (inl `  z )  =  y )
4340, 42fveq12d 5382 . . . . . . . . . . . . . 14  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  (case ( S ,  (  _I  |`  1o ) ) `  (inl `  z ) )  =  ( G `  y ) )
44 peano2 4469 . . . . . . . . . . . . . . . 16  |-  ( z  e.  om  ->  suc  z  e.  om )
45 suceq 4284 . . . . . . . . . . . . . . . . 17  |-  ( x  =  z  ->  suc  x  =  suc  z )
4645, 14fvmptg 5451 . . . . . . . . . . . . . . . 16  |-  ( ( z  e.  om  /\  suc  z  e.  om )  ->  ( S `  z )  =  suc  z )
4744, 46mpdan 415 . . . . . . . . . . . . . . 15  |-  ( z  e.  om  ->  ( S `  z )  =  suc  z )
4847adantr 272 . . . . . . . . . . . . . 14  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  ( S `  z )  =  suc  z )
4938, 43, 483eqtr3d 2155 . . . . . . . . . . . . 13  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  ( G `  y )  =  suc  z )
50 peano3 4470 . . . . . . . . . . . . . 14  |-  ( z  e.  om  ->  suc  z  =/=  (/) )
5150adantr 272 . . . . . . . . . . . . 13  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  suc  z  =/=  (/) )
5249, 51eqnetrd 2306 . . . . . . . . . . . 12  |-  ( ( z  e.  om  /\  y  =  (inl `  z
) )  ->  ( G `  y )  =/=  (/) )
5352adantl 273 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( G `  y )  =/=  (/) )
5453necomd 2368 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  (/)  =/=  ( G `
 y ) )
5554neneqd 2303 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  -.  (/)  =  ( G `  y ) )
56 simplr 502 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  x  =  (/) )
5756eqeq1d 2123 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  (/)  =  ( G `
 y ) ) )
5855, 57mtbird 645 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  -.  x  =  ( G `  y ) )
59 djune 6915 . . . . . . . . . . . 12  |-  ( ( z  e.  _V  /\  x  e.  _V )  ->  (inl `  z )  =/=  (inr `  x )
)
6059elvd 2662 . . . . . . . . . . 11  |-  ( z  e.  _V  ->  (inl `  z )  =/=  (inr `  x ) )
6160elv 2661 . . . . . . . . . 10  |-  (inl `  z )  =/=  (inr `  x )
6261neii 2284 . . . . . . . . 9  |-  -.  (inl `  z )  =  (inr
`  x )
63 simprr 504 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  y  =  (inl
`  z ) )
64 simpr 109 . . . . . . . . . . . 12  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  x  =  (/) )
6564iftrued 3447 . . . . . . . . . . 11  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  if ( x  =  (/) ,  (inr
`  x ) ,  (inl `  U. x ) )  =  (inr `  x ) )
6665adantr 272 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  if ( x  =  (/) ,  (inr `  x ) ,  (inl
`  U. x ) )  =  (inr `  x
) )
6763, 66eqeq12d 2129 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( y  =  if ( x  =  (/) ,  (inr `  x
) ,  (inl `  U. x ) )  <->  (inl `  z
)  =  (inr `  x ) ) )
6862, 67mtbiri 647 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  -.  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) )
6958, 682falsed 674 . . . . . . 7  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
7069rexlimdvaa 2524 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  ( E. z  e.  om  y  =  (inl `  z
)  ->  ( x  =  ( G `  y )  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) ) )
71 simplr 502 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  x  =  (/) )
7229a1i 9 . . . . . . . . . . . 12  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  G  = case ( S ,  (  _I  |`  1o )
) )
73 simpr 109 . . . . . . . . . . . 12  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  y  =  (inr `  z )
)
7472, 73fveq12d 5382 . . . . . . . . . . 11  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  ( G `  y )  =  (case ( S , 
(  _I  |`  1o ) ) `  (inr `  z ) ) )
7514funmpt2 5120 . . . . . . . . . . . . . 14  |-  Fun  S
7675a1i 9 . . . . . . . . . . . . 13  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  Fun  S )
77 fnresi 5198 . . . . . . . . . . . . . 14  |-  (  _I  |`  1o )  Fn  1o
7877a1i 9 . . . . . . . . . . . . 13  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  (  _I  |`  1o )  Fn  1o )
79 simpl 108 . . . . . . . . . . . . 13  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  z  e.  1o )
8076, 78, 79caseinr 6929 . . . . . . . . . . . 12  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  (case ( S ,  (  _I  |`  1o ) ) `  (inr `  z ) )  =  ( (  _I  |`  1o ) `  z
) )
81 fvresi 5567 . . . . . . . . . . . . 13  |-  ( z  e.  1o  ->  (
(  _I  |`  1o ) `
 z )  =  z )
8281adantr 272 . . . . . . . . . . . 12  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  (
(  _I  |`  1o ) `
 z )  =  z )
8380, 82eqtrd 2147 . . . . . . . . . . 11  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  (case ( S ,  (  _I  |`  1o ) ) `  (inr `  z ) )  =  z )
84 el1o 6288 . . . . . . . . . . . 12  |-  ( z  e.  1o  <->  z  =  (/) )
8579, 84sylib 121 . . . . . . . . . . 11  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  z  =  (/) )
8674, 83, 853eqtrd 2151 . . . . . . . . . 10  |-  ( ( z  e.  1o  /\  y  =  (inr `  z
) )  ->  ( G `  y )  =  (/) )
8786adantl 273 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( G `  y )  =  (/) )
8871, 87eqtr4d 2150 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  x  =  ( G `  y ) )
8985adantl 273 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  z  =  (/) )
9071, 89eqtr4d 2150 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  x  =  z )
9190fveq2d 5379 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  (inr `  x
)  =  (inr `  z ) )
9265adantr 272 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  if ( x  =  (/) ,  (inr `  x ) ,  (inl
`  U. x ) )  =  (inr `  x
) )
93 simprr 504 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  y  =  (inr
`  z ) )
9491, 92, 933eqtr4rd 2158 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) )
9588, 942thd 174 . . . . . . 7  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
9695rexlimdvaa 2524 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  ( E. z  e.  1o  y  =  (inr `  z
)  ->  ( x  =  ( G `  y )  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) ) )
97 djur 6906 . . . . . . . 8  |-  ( y  e.  ( om 1o )  <-> 
( E. z  e. 
om  y  =  (inl
`  z )  \/ 
E. z  e.  1o  y  =  (inr `  z
) ) )
9897biimpi 119 . . . . . . 7  |-  ( y  e.  ( om 1o )  ->  ( E. z  e.  om  y  =  (inl
`  z )  \/ 
E. z  e.  1o  y  =  (inr `  z
) ) )
9998ad2antlr 478 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  ( E. z  e.  om  y  =  (inl `  z
)  \/  E. z  e.  1o  y  =  (inr
`  z ) ) )
10070, 96, 99mpjaod 690 . . . . 5  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  x  =  (/) )  ->  (
x  =  ( G `
 y )  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
101 simplll 505 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  x  e.  om )
102 simplr 502 . . . . . . . . . . . 12  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  -.  x  =  (/) )
103102neqned 2289 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  x  =/=  (/) )
104 nnsucpred 4490 . . . . . . . . . . 11  |-  ( ( x  e.  om  /\  x  =/=  (/) )  ->  suc  U. x  =  x )
105101, 103, 104syl2anc 406 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  suc  U. x  =  x )
106105eqeq2d 2126 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( suc  z  =  suc  U. x  <->  suc  z  =  x ) )
107 eqcom 2117 . . . . . . . . 9  |-  ( suc  z  =  x  <->  x  =  suc  z )
108106, 107syl6bb 195 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( suc  z  =  suc  U. x  <->  x  =  suc  z ) )
109 simprr 504 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  y  =  (inl
`  z ) )
110 simpr 109 . . . . . . . . . . . . 13  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  ->  -.  x  =  (/) )
111110iffalsed 3450 . . . . . . . . . . . 12  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  ->  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) )  =  (inl `  U. x ) )
112111adantr 272 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  if ( x  =  (/) ,  (inr `  x ) ,  (inl
`  U. x ) )  =  (inl `  U. x ) )
113109, 112eqeq12d 2129 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( y  =  if ( x  =  (/) ,  (inr `  x
) ,  (inl `  U. x ) )  <->  (inl `  z
)  =  (inl `  U. x ) ) )
114 vuniex 4320 . . . . . . . . . . . 12  |-  U. x  e.  _V
115 inl11 6902 . . . . . . . . . . . 12  |-  ( ( z  e.  _V  /\  U. x  e.  _V )  ->  ( (inl `  z
)  =  (inl `  U. x )  <->  z  =  U. x ) )
116114, 115mpan2 419 . . . . . . . . . . 11  |-  ( z  e.  _V  ->  (
(inl `  z )  =  (inl `  U. x )  <-> 
z  =  U. x
) )
117116elv 2661 . . . . . . . . . 10  |-  ( (inl
`  z )  =  (inl `  U. x )  <-> 
z  =  U. x
)
118113, 117syl6bb 195 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( y  =  if ( x  =  (/) ,  (inr `  x
) ,  (inl `  U. x ) )  <->  z  =  U. x ) )
119 nnon 4483 . . . . . . . . . . 11  |-  ( z  e.  om  ->  z  e.  On )
120119ad2antrl 479 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  z  e.  On )
1217ad3antrrr 481 . . . . . . . . . . 11  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  U. x  e.  om )
122 nnon 4483 . . . . . . . . . . 11  |-  ( U. x  e.  om  ->  U. x  e.  On )
123121, 122syl 14 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  U. x  e.  On )
124 suc11 4433 . . . . . . . . . 10  |-  ( ( z  e.  On  /\  U. x  e.  On )  ->  ( suc  z  =  suc  U. x  <->  z  =  U. x ) )
125120, 123, 124syl2anc 406 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( suc  z  =  suc  U. x  <->  z  =  U. x ) )
126118, 125bitr4d 190 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( y  =  if ( x  =  (/) ,  (inr `  x
) ,  (inl `  U. x ) )  <->  suc  z  =  suc  U. x ) )
12749adantl 273 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( G `  y )  =  suc  z )
128127eqeq2d 2126 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  x  =  suc  z ) )
129108, 126, 1283bitr4rd 220 . . . . . . 7  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  om  /\  y  =  (inl `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
130129rexlimdvaa 2524 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  -> 
( E. z  e. 
om  y  =  (inl
`  z )  -> 
( x  =  ( G `  y )  <-> 
y  =  if ( x  =  (/) ,  (inr
`  x ) ,  (inl `  U. x ) ) ) ) )
131 simplr 502 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  -.  x  =  (/) )
13286adantl 273 . . . . . . . . . 10  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( G `  y )  =  (/) )
133132eqeq2d 2126 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  x  =  (/) ) )
134131, 133mtbird 645 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  -.  x  =  ( G `  y ) )
135 djune 6915 . . . . . . . . . . . 12  |-  ( ( U. x  e.  _V  /\  z  e.  _V )  ->  (inl `  U. x )  =/=  (inr `  z
) )
136135elvd 2662 . . . . . . . . . . 11  |-  ( U. x  e.  _V  ->  (inl
`  U. x )  =/=  (inr `  z )
)
137114, 136ax-mp 7 . . . . . . . . . 10  |-  (inl `  U. x )  =/=  (inr `  z )
138137nesymi 2328 . . . . . . . . 9  |-  -.  (inr `  z )  =  (inl
`  U. x )
13973, 111eqeqan12rd 2131 . . . . . . . . 9  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( y  =  if ( x  =  (/) ,  (inr `  x
) ,  (inl `  U. x ) )  <->  (inr `  z
)  =  (inl `  U. x ) ) )
140138, 139mtbiri 647 . . . . . . . 8  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  -.  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) )
141134, 1402falsed 674 . . . . . . 7  |-  ( ( ( ( x  e. 
om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  /\  ( z  e.  1o  /\  y  =  (inr `  z ) ) )  ->  ( x  =  ( G `  y
)  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
142141rexlimdvaa 2524 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  -> 
( E. z  e.  1o  y  =  (inr
`  z )  -> 
( x  =  ( G `  y )  <-> 
y  =  if ( x  =  (/) ,  (inr
`  x ) ,  (inl `  U. x ) ) ) ) )
14398ad2antlr 478 . . . . . 6  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  -> 
( E. z  e. 
om  y  =  (inl
`  z )  \/ 
E. z  e.  1o  y  =  (inr `  z
) ) )
144130, 142, 143mpjaod 690 . . . . 5  |-  ( ( ( x  e.  om  /\  y  e.  ( om 1o ) )  /\  -.  x  =  (/) )  -> 
( x  =  ( G `  y )  <-> 
y  =  if ( x  =  (/) ,  (inr
`  x ) ,  (inl `  U. x ) ) ) )
145 exmiddc 804 . . . . . . 7  |-  (DECID  x  =  (/)  ->  ( x  =  (/)  \/  -.  x  =  (/) ) )
14611, 145syl 14 . . . . . 6  |-  ( x  e.  om  ->  (
x  =  (/)  \/  -.  x  =  (/) ) )
147146adantr 272 . . . . 5  |-  ( ( x  e.  om  /\  y  e.  ( om 1o ) )  ->  (
x  =  (/)  \/  -.  x  =  (/) ) )
148100, 144, 147mpjaodan 770 . . . 4  |-  ( ( x  e.  om  /\  y  e.  ( om 1o ) )  ->  (
x  =  ( G `
 y )  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
149148adantl 273 . . 3  |-  ( ( T.  /\  ( x  e.  om  /\  y  e.  ( om 1o ) ) )  ->  ( x  =  ( G `  y )  <->  y  =  if ( x  =  (/) ,  (inr `  x ) ,  (inl `  U. x ) ) ) )
1501, 13, 32, 149f1o2d 5929 . 2  |-  ( T. 
->  F : om -1-1-onto-> ( om 1o ) )
151150mptru 1323 1  |-  F : om
-1-1-onto-> ( om 1o )
Colors of variables: wff set class
Syntax hints:   -. wn 3    /\ wa 103    <-> wb 104    \/ wo 680  DECID wdc 802    = wceq 1314   T. wtru 1315    e. wcel 1463    =/= wne 2282   E.wrex 2391   _Vcvv 2657    C_ wss 3037   (/)c0 3329   ifcif 3440   U.cuni 3702    |-> cmpt 3949    _I cid 4170   Oncon0 4245   suc csuc 4247   omcom 4464    |` cres 4501   Fun wfun 5075    Fn wfn 5076   -->wf 5077   -1-1-onto->wf1o 5080   ` cfv 5081   1oc1o 6260   ⊔ cdju 6874  inlcinl 6882  inrcinr 6883  casecdjucase 6920
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-13 1474  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4006  ax-nul 4014  ax-pow 4058  ax-pr 4091  ax-un 4315  ax-setind 4412  ax-iinf 4462
This theorem depends on definitions:  df-bi 116  df-dc 803  df-3an 947  df-tru 1317  df-fal 1320  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2244  df-ne 2283  df-ral 2395  df-rex 2396  df-rab 2399  df-v 2659  df-sbc 2879  df-csb 2972  df-dif 3039  df-un 3041  df-in 3043  df-ss 3050  df-nul 3330  df-if 3441  df-pw 3478  df-sn 3499  df-pr 3500  df-op 3502  df-uni 3703  df-int 3738  df-br 3896  df-opab 3950  df-mpt 3951  df-tr 3987  df-id 4175  df-iord 4248  df-on 4250  df-suc 4253  df-iom 4465  df-xp 4505  df-rel 4506  df-cnv 4507  df-co 4508  df-dm 4509  df-rn 4510  df-res 4511  df-ima 4512  df-iota 5046  df-fun 5083  df-fn 5084  df-f 5085  df-f1 5086  df-fo 5087  df-f1o 5088  df-fv 5089  df-1st 5992  df-2nd 5993  df-1o 6267  df-dju 6875  df-inl 6884  df-inr 6885  df-case 6921
This theorem is referenced by:  omp1eom  6932
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