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Theorem updjud 7047
Description: Universal property of the disjoint union. (Proposed by BJ, 25-Jun-2022.) (Contributed by AV, 28-Jun-2022.)
Hypotheses
Ref Expression
updjud.f  |-  ( ph  ->  F : A --> C )
updjud.g  |-  ( ph  ->  G : B --> C )
updjud.a  |-  ( ph  ->  A  e.  V )
updjud.b  |-  ( ph  ->  B  e.  W )
Assertion
Ref Expression
updjud  |-  ( ph  ->  E! h ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G ) )
Distinct variable groups:    A, h    B, h    C, h    h, F   
h, G    ph, h
Allowed substitution hints:    V( h)    W( h)

Proof of Theorem updjud
Dummy variables  k  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 updjud.a . . . . . 6  |-  ( ph  ->  A  e.  V )
2 updjud.b . . . . . 6  |-  ( ph  ->  B  e.  W )
31, 2jca 304 . . . . 5  |-  ( ph  ->  ( A  e.  V  /\  B  e.  W
) )
4 djuex 7008 . . . . 5  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( A B )  e.  _V )
5 mptexg 5710 . . . . 5  |-  ( ( A B )  e.  _V  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  e.  _V )
63, 4, 53syl 17 . . . 4  |-  ( ph  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  e.  _V )
7 feq1 5320 . . . . . . 7  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( h : ( A B ) --> C  <->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C ) )
8 coeq1 4761 . . . . . . . 8  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( h  o.  (inl  |`  A ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) ) )
98eqeq1d 2174 . . . . . . 7  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( ( h  o.  (inl  |`  A ) )  =  F  <->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F ) )
10 coeq1 4761 . . . . . . . 8  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( h  o.  (inr  |`  B ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) ) )
1110eqeq1d 2174 . . . . . . 7  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( ( h  o.  (inr  |`  B ) )  =  G  <->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )
127, 9, 113anbi123d 1302 . . . . . 6  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  (
h  o.  (inr  |`  B ) )  =  G )  <-> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) ) )
13 eqeq1 2172 . . . . . . . 8  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( h  =  k  <-> 
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) )
1413imbi2d 229 . . . . . . 7  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k )  <->  ( (
k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) )
1514ralbidv 2466 . . . . . 6  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( A. k  e. 
_V  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k )  <->  A. k  e.  _V  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) )
1612, 15anbi12d 465 . . . . 5  |-  ( h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  -> 
( ( ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k ) )  <->  ( (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) ) )
1716adantl 275 . . . 4  |-  ( (
ph  /\  h  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) )  -> 
( ( ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k ) )  <->  ( (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) ) )
18 updjud.f . . . . . 6  |-  ( ph  ->  F : A --> C )
19 updjud.g . . . . . 6  |-  ( ph  ->  G : B --> C )
20 eqid 2165 . . . . . 6  |-  ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )
2118, 19, 20updjudhf 7044 . . . . 5  |-  ( ph  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C )
2218, 19, 20updjudhcoinlf 7045 . . . . 5  |-  ( ph  ->  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F )
2318, 19, 20updjudhcoinrg 7046 . . . . 5  |-  ( ph  ->  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )
24 simpr 109 . . . . . . 7  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )
25 eqeq2 2175 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  ->  ( (
k  o.  (inl  |`  A ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  <->  ( k  o.  (inl  |`  A ) )  =  F ) )
26 fvres 5510 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( z  e.  A  ->  (
(inl  |`  A ) `  z )  =  (inl
`  z ) )
2726eqcomd 2171 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( z  e.  A  ->  (inl `  z )  =  ( (inl  |`  A ) `  z ) )
2827eqeq2d 2177 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( z  e.  A  ->  (
y  =  (inl `  z )  <->  y  =  ( (inl  |`  A ) `
 z ) ) )
2928adantl 275 . . . . . . . . . . . . . . . . . . . . . . . . . 26  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( y  =  (inl
`  z )  <->  y  =  ( (inl  |`  A ) `
 z ) ) )
30 fveq1 5485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  -> 
( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) ) `
 z )  =  ( ( k  o.  (inl  |`  A ) ) `
 z ) )
3130ad2antrr 480 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) ) `
 z )  =  ( ( k  o.  (inl  |`  A ) ) `
 z ) )
32 inlresf1 7026 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  |-  (inl  |`  A ) : A -1-1-> ( A B )
33 f1fn 5395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  |-  ( (inl  |`  A ) : A -1-1-> ( A B )  ->  (inl  |`  A )  Fn  A
)
3432, 33mp1i 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  -> 
(inl  |`  A )  Fn  A )
35 fvco2 5555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( (inl  |`  A )  Fn  A  /\  z  e.  A )  ->  (
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) ) `
 z )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inl  |`  A ) `
 z ) ) )
3634, 35sylan 281 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) ) `
 z )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inl  |`  A ) `
 z ) ) )
37 fvco2 5555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( (inl  |`  A )  Fn  A  /\  z  e.  A )  ->  (
( k  o.  (inl  |`  A ) ) `  z )  =  ( k `  ( (inl  |`  A ) `  z
) ) )
3834, 37sylan 281 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( ( k  o.  (inl  |`  A ) ) `
 z )  =  ( k `  (
(inl  |`  A ) `  z ) ) )
3931, 36, 383eqtr3d 2206 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inl  |`  A ) `
 z ) )  =  ( k `  ( (inl  |`  A ) `
 z ) ) )
40 fveq2 5486 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( y  =  ( (inl  |`  A ) `
 z )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  (
(inl  |`  A ) `  z ) ) )
41 fveq2 5486 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( y  =  ( (inl  |`  A ) `
 z )  -> 
( k `  y
)  =  ( k `
 ( (inl  |`  A ) `
 z ) ) )
4240, 41eqeq12d 2180 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( y  =  ( (inl  |`  A ) `
 z )  -> 
( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y )  <-> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inl  |`  A ) `
 z ) )  =  ( k `  ( (inl  |`  A ) `
 z ) ) ) )
4339, 42syl5ibrcom 156 . . . . . . . . . . . . . . . . . . . . . . . . . 26  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( y  =  ( (inl  |`  A ) `  z )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
4429, 43sylbid 149 . . . . . . . . . . . . . . . . . . . . . . . . 25  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  /\  z  e.  A )  ->  ( y  =  (inl
`  z )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) )
4544expimpd 361 . . . . . . . . . . . . . . . . . . . . . . . 24  |-  ( ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  /\  ph )  -> 
( ( z  e.  A  /\  y  =  (inl `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
4645ex 114 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) )  -> 
( ph  ->  ( ( z  e.  A  /\  y  =  (inl `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
4746eqcoms 2168 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( k  o.  (inl  |`  A ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  -> 
( ph  ->  ( ( z  e.  A  /\  y  =  (inl `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
4825, 47syl6bir 163 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  ->  ( (
k  o.  (inl  |`  A ) )  =  F  -> 
( ph  ->  ( ( z  e.  A  /\  y  =  (inl `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) ) )
4948com23 78 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  ->  ( ph  ->  ( ( k  o.  (inl  |`  A ) )  =  F  ->  (
( z  e.  A  /\  y  =  (inl `  z ) )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) ) ) )
50493ad2ant2 1009 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  ->  ( ph  ->  ( ( k  o.  (inl  |`  A ) )  =  F  -> 
( ( z  e.  A  /\  y  =  (inl `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) ) )
5150impcom 124 . . . . . . . . . . . . . . . . . 18  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( k  o.  (inl  |`  A ) )  =  F  ->  (
( z  e.  A  /\  y  =  (inl `  z ) )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) ) )
5251com12 30 . . . . . . . . . . . . . . . . 17  |-  ( ( k  o.  (inl  |`  A ) )  =  F  -> 
( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( z  e.  A  /\  y  =  (inl `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
53523ad2ant2 1009 . . . . . . . . . . . . . . . 16  |-  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( z  e.  A  /\  y  =  (inl `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
5453impcom 124 . . . . . . . . . . . . . . 15  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
z  e.  A  /\  y  =  (inl `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
5554com12 30 . . . . . . . . . . . . . 14  |-  ( ( z  e.  A  /\  y  =  (inl `  z
) )  ->  (
( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
5655rexlimiva 2578 . . . . . . . . . . . . 13  |-  ( E. z  e.  A  y  =  (inl `  z
)  ->  ( (
( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
57 eqeq2 2175 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G  ->  ( (
k  o.  (inr  |`  B ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  <->  ( k  o.  (inr  |`  B ) )  =  G ) )
58 fvres 5510 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( z  e.  B  ->  (
(inr  |`  B ) `  z )  =  (inr
`  z ) )
5958eqcomd 2171 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( z  e.  B  ->  (inr `  z )  =  ( (inr  |`  B ) `  z ) )
6059eqeq2d 2177 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( z  e.  B  ->  (
y  =  (inr `  z )  <->  y  =  ( (inr  |`  B ) `
 z ) ) )
6160adantl 275 . . . . . . . . . . . . . . . . . . . . . . . . . 26  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( y  =  (inr
`  z )  <->  y  =  ( (inr  |`  B ) `
 z ) ) )
62 fveq1 5485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  -> 
( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) ) `
 z )  =  ( ( k  o.  (inr  |`  B ) ) `
 z ) )
6362ad2antrr 480 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) ) `
 z )  =  ( ( k  o.  (inr  |`  B ) ) `
 z ) )
64 inrresf1 7027 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  |-  (inr  |`  B ) : B -1-1-> ( A B )
65 f1fn 5395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  |-  ( (inr  |`  B ) : B -1-1-> ( A B )  ->  (inr  |`  B )  Fn  B
)
6664, 65mp1i 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  -> 
(inr  |`  B )  Fn  B )
67 fvco2 5555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( (inr  |`  B )  Fn  B  /\  z  e.  B )  ->  (
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) ) `
 z )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inr  |`  B ) `
 z ) ) )
6866, 67sylan 281 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) ) `
 z )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inr  |`  B ) `
 z ) ) )
69 fvco2 5555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  |-  ( ( (inr  |`  B )  Fn  B  /\  z  e.  B )  ->  (
( k  o.  (inr  |`  B ) ) `  z )  =  ( k `  ( (inr  |`  B ) `  z
) ) )
7066, 69sylan 281 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( ( k  o.  (inr  |`  B ) ) `
 z )  =  ( k `  (
(inr  |`  B ) `  z ) ) )
7163, 68, 703eqtr3d 2206 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inr  |`  B ) `
 z ) )  =  ( k `  ( (inr  |`  B ) `
 z ) ) )
72 fveq2 5486 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( y  =  ( (inr  |`  B ) `
 z )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  (
(inr  |`  B ) `  z ) ) )
73 fveq2 5486 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  |-  ( y  =  ( (inr  |`  B ) `
 z )  -> 
( k `  y
)  =  ( k `
 ( (inr  |`  B ) `
 z ) ) )
7472, 73eqeq12d 2180 . . . . . . . . . . . . . . . . . . . . . . . . . . 27  |-  ( y  =  ( (inr  |`  B ) `
 z )  -> 
( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y )  <-> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  ( (inr  |`  B ) `
 z ) )  =  ( k `  ( (inr  |`  B ) `
 z ) ) ) )
7571, 74syl5ibrcom 156 . . . . . . . . . . . . . . . . . . . . . . . . . 26  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( y  =  ( (inr  |`  B ) `  z )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
7661, 75sylbid 149 . . . . . . . . . . . . . . . . . . . . . . . . 25  |-  ( ( ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  /\  z  e.  B )  ->  ( y  =  (inr
`  z )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) )
7776expimpd 361 . . . . . . . . . . . . . . . . . . . . . . . 24  |-  ( ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  /\  ph )  -> 
( ( z  e.  B  /\  y  =  (inr `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
7877ex 114 . . . . . . . . . . . . . . . . . . . . . . 23  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) )  -> 
( ph  ->  ( ( z  e.  B  /\  y  =  (inr `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
7978eqcoms 2168 . . . . . . . . . . . . . . . . . . . . . 22  |-  ( ( k  o.  (inr  |`  B ) )  =  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  -> 
( ph  ->  ( ( z  e.  B  /\  y  =  (inr `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
8057, 79syl6bir 163 . . . . . . . . . . . . . . . . . . . . 21  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G  ->  ( (
k  o.  (inr  |`  B ) )  =  G  -> 
( ph  ->  ( ( z  e.  B  /\  y  =  (inr `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) ) )
8180com23 78 . . . . . . . . . . . . . . . . . . . 20  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G  ->  ( ph  ->  ( ( k  o.  (inr  |`  B ) )  =  G  ->  (
( z  e.  B  /\  y  =  (inr `  z ) )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) ) ) )
82813ad2ant3 1010 . . . . . . . . . . . . . . . . . . 19  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  ->  ( ph  ->  ( ( k  o.  (inr  |`  B ) )  =  G  -> 
( ( z  e.  B  /\  y  =  (inr `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) ) )
8382impcom 124 . . . . . . . . . . . . . . . . . 18  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( k  o.  (inr  |`  B ) )  =  G  ->  (
( z  e.  B  /\  y  =  (inr `  z ) )  -> 
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) ) )
8483com12 30 . . . . . . . . . . . . . . . . 17  |-  ( ( k  o.  (inr  |`  B ) )  =  G  -> 
( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( z  e.  B  /\  y  =  (inr `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
85843ad2ant3 1010 . . . . . . . . . . . . . . . 16  |-  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( z  e.  B  /\  y  =  (inr `  z )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) ) )
8685impcom 124 . . . . . . . . . . . . . . 15  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
z  e.  B  /\  y  =  (inr `  z
) )  ->  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
8786com12 30 . . . . . . . . . . . . . 14  |-  ( ( z  e.  B  /\  y  =  (inr `  z
) )  ->  (
( ( ph  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
8887rexlimiva 2578 . . . . . . . . . . . . 13  |-  ( E. z  e.  B  y  =  (inr `  z
)  ->  ( (
( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
8956, 88jaoi 706 . . . . . . . . . . . 12  |-  ( ( E. z  e.  A  y  =  (inl `  z
)  \/  E. z  e.  B  y  =  (inr `  z ) )  ->  ( ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
90 djur 7034 . . . . . . . . . . . . 13  |-  ( y  e.  ( A B )  <-> 
( E. z  e.  A  y  =  (inl
`  z )  \/ 
E. z  e.  B  y  =  (inr `  z
) ) )
9190biimpi 119 . . . . . . . . . . . 12  |-  ( y  e.  ( A B )  ->  ( E. z  e.  A  y  =  (inl `  z )  \/ 
E. z  e.  B  y  =  (inr `  z
) ) )
9289, 91syl11 31 . . . . . . . . . . 11  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( y  e.  ( A B )  ->  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) ) )
9392ralrimiv 2538 . . . . . . . . . 10  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  A. y  e.  ( A B )
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y )  =  ( k `  y ) )
94 ffn 5337 . . . . . . . . . . . . 13  |-  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  -> 
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  Fn  ( A B ) )
95943ad2ant1 1008 . . . . . . . . . . . 12  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  ->  (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  Fn  ( A B ) )
9695adantl 275 . . . . . . . . . . 11  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  Fn  ( A B ) )
97 ffn 5337 . . . . . . . . . . . 12  |-  ( k : ( A B ) --> C  ->  k  Fn  ( A B ) )
98973ad2ant1 1008 . . . . . . . . . . 11  |-  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  k  Fn  ( A B ) )
99 eqfnfv 5583 . . . . . . . . . . 11  |-  ( ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  Fn  ( A B )  /\  k  Fn  ( A B )
)  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k  <->  A. y  e.  ( A B ) ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
10096, 98, 99syl2an 287 . . . . . . . . . 10  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k  <->  A. y  e.  ( A B ) ( ( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) `  y
)  =  ( k `
 y ) ) )
10193, 100mpbird 166 . . . . . . . . 9  |-  ( ( ( ph  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  /\  ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k )
102101ex 114 . . . . . . . 8  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  (
k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) )
103102ralrimivw 2540 . . . . . . 7  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  ->  A. k  e.  _V  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  (
k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) )
10424, 103jca 304 . . . . . 6  |-  ( (
ph  /\  ( (
x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G ) )  -> 
( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) )
105104ex 114 . . . . 5  |-  ( ph  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  ->  (
( ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) ) )
10621, 22, 23, 105mp3and 1330 . . . 4  |-  ( ph  ->  ( ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) ) : ( A B ) --> C  /\  ( ( x  e.  ( A B ) 
|->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inl  |`  A ) )  =  F  /\  (
( x  e.  ( A B )  |->  if ( ( 1st `  x
)  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  o.  (inr  |`  B ) )  =  G )  /\  A. k  e.  _V  (
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  ( x  e.  ( A B )  |->  if ( ( 1st `  x )  =  (/) ,  ( F `  ( 2nd `  x ) ) ,  ( G `  ( 2nd `  x ) ) ) )  =  k ) ) )
1076, 17, 106rspcedvd 2836 . . 3  |-  ( ph  ->  E. h  e.  _V  ( ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  (
h  o.  (inr  |`  B ) )  =  G )  /\  A. k  e. 
_V  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k ) ) )
108 feq1 5320 . . . . 5  |-  ( h  =  k  ->  (
h : ( A B ) --> C  <->  k :
( A B ) --> C ) )
109 coeq1 4761 . . . . . 6  |-  ( h  =  k  ->  (
h  o.  (inl  |`  A ) )  =  ( k  o.  (inl  |`  A ) ) )
110109eqeq1d 2174 . . . . 5  |-  ( h  =  k  ->  (
( h  o.  (inl  |`  A ) )  =  F  <->  ( k  o.  (inl  |`  A ) )  =  F ) )
111 coeq1 4761 . . . . . 6  |-  ( h  =  k  ->  (
h  o.  (inr  |`  B ) )  =  ( k  o.  (inr  |`  B ) ) )
112111eqeq1d 2174 . . . . 5  |-  ( h  =  k  ->  (
( h  o.  (inr  |`  B ) )  =  G  <->  ( k  o.  (inr  |`  B ) )  =  G ) )
113108, 110, 1123anbi123d 1302 . . . 4  |-  ( h  =  k  ->  (
( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G )  <-> 
( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G ) ) )
114113reu8 2922 . . 3  |-  ( E! h  e.  _V  (
h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G )  <->  E. h  e.  _V  ( ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  (
h  o.  (inr  |`  B ) )  =  G )  /\  A. k  e. 
_V  ( ( k : ( A B ) --> C  /\  ( k  o.  (inl  |`  A ) )  =  F  /\  ( k  o.  (inr  |`  B ) )  =  G )  ->  h  =  k ) ) )
115107, 114sylibr 133 . 2  |-  ( ph  ->  E! h  e.  _V  ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G ) )
116 reuv 2745 . 2  |-  ( E! h  e.  _V  (
h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G )  <-> 
E! h ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G ) )
117115, 116sylib 121 1  |-  ( ph  ->  E! h ( h : ( A B ) --> C  /\  ( h  o.  (inl  |`  A ) )  =  F  /\  ( h  o.  (inr  |`  B ) )  =  G ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 103    <-> wb 104    \/ wo 698    /\ w3a 968    = wceq 1343   E!weu 2014    e. wcel 2136   A.wral 2444   E.wrex 2445   E!wreu 2446   _Vcvv 2726   (/)c0 3409   ifcif 3520    |-> cmpt 4043    |` cres 4606    o. ccom 4608    Fn wfn 5183   -->wf 5184   -1-1->wf1 5185   ` cfv 5188   1stc1st 6106   2ndc2nd 6107   ⊔ cdju 7002  inlcinl 7010  inrcinr 7011
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 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-suc 4349  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-1st 6108  df-2nd 6109  df-1o 6384  df-dju 7003  df-inl 7012  df-inr 7013
This theorem is referenced by: (None)
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