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Theorem hofval 15845
Description: Value of the Hom functor, which is a bifunctor (a functor of two arguments), contravariant in the first argument and covariant in the second, from  (oppCat `  C )  X.  C to  SetCat, whose object part is the hom-function 
Hom, and with morphism part given by pre- and post-composition. (Contributed by Mario Carneiro, 15-Jan-2017.)
Hypotheses
Ref Expression
hofval.m  |-  M  =  (HomF
`  C )
hofval.c  |-  ( ph  ->  C  e.  Cat )
hofval.b  |-  B  =  ( Base `  C
)
hofval.h  |-  H  =  ( Hom  `  C
)
hofval.o  |-  .x.  =  (comp `  C )
Assertion
Ref Expression
hofval  |-  ( ph  ->  M  =  <. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B )  |->  ( f  e.  ( ( 1st `  y ) H ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y ) )  |->  ( h  e.  ( H `  x
)  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) ( <.
( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >. )
Distinct variable groups:    f, g, h, x, y, B    ph, f,
g, h, x, y    C, f, g, h, x, y    f, H, g, h, x, y    .x. , f,
g, h, x, y
Allowed substitution hints:    M( x, y, f, g, h)

Proof of Theorem hofval
Dummy variables  b 
c are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 hofval.m . 2  |-  M  =  (HomF
`  C )
2 df-hof 15843 . . . 4  |- HomF  =  ( c  e.  Cat  |->  <. ( Hom f  `  c ) ,  [_ ( Base `  c )  /  b ]_ ( x  e.  ( b  X.  b ) ,  y  e.  ( b  X.  b ) 
|->  ( f  e.  ( ( 1st `  y
) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) ) ) >.
)
32a1i 11 . . 3  |-  ( ph  -> HomF  =  ( c  e.  Cat  |->  <. ( Hom f  `  c ) , 
[_ ( Base `  c
)  /  b ]_ ( x  e.  (
b  X.  b ) ,  y  e.  ( b  X.  b ) 
|->  ( f  e.  ( ( 1st `  y
) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) ) ) >.
) )
4 simpr 459 . . . . 5  |-  ( (
ph  /\  c  =  C )  ->  c  =  C )
54fveq2d 5853 . . . 4  |-  ( (
ph  /\  c  =  C )  ->  ( Hom f  `  c )  =  ( Hom f  `  C ) )
6 fvex 5859 . . . . . 6  |-  ( Base `  c )  e.  _V
76a1i 11 . . . . 5  |-  ( (
ph  /\  c  =  C )  ->  ( Base `  c )  e. 
_V )
84fveq2d 5853 . . . . . 6  |-  ( (
ph  /\  c  =  C )  ->  ( Base `  c )  =  ( Base `  C
) )
9 hofval.b . . . . . 6  |-  B  =  ( Base `  C
)
108, 9syl6eqr 2461 . . . . 5  |-  ( (
ph  /\  c  =  C )  ->  ( Base `  c )  =  B )
11 simpr 459 . . . . . . 7  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  b  =  B )
1211sqxpeqd 4849 . . . . . 6  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
b  X.  b )  =  ( B  X.  B ) )
13 simplr 754 . . . . . . . . . 10  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  c  =  C )
1413fveq2d 5853 . . . . . . . . 9  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  ( Hom  `  c )  =  ( Hom  `  C
) )
15 hofval.h . . . . . . . . 9  |-  H  =  ( Hom  `  C
)
1614, 15syl6eqr 2461 . . . . . . . 8  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  ( Hom  `  c )  =  H )
1716oveqd 6295 . . . . . . 7  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
( 1st `  y
) ( Hom  `  c
) ( 1st `  x
) )  =  ( ( 1st `  y
) H ( 1st `  x ) ) )
1816oveqd 6295 . . . . . . 7  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
( 2nd `  x
) ( Hom  `  c
) ( 2nd `  y
) )  =  ( ( 2nd `  x
) H ( 2nd `  y ) ) )
1916fveq1d 5851 . . . . . . . 8  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
( Hom  `  c ) `
 x )  =  ( H `  x
) )
2013fveq2d 5853 . . . . . . . . . . 11  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (comp `  c )  =  (comp `  C ) )
21 hofval.o . . . . . . . . . . 11  |-  .x.  =  (comp `  C )
2220, 21syl6eqr 2461 . . . . . . . . . 10  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (comp `  c )  =  .x.  )
2322oveqd 6295 . . . . . . . . 9  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  ( <. ( 1st `  y
) ,  ( 1st `  x ) >. (comp `  c ) ( 2nd `  y ) )  =  ( <. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) )
2422oveqd 6295 . . . . . . . . . 10  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
x (comp `  c
) ( 2nd `  y
) )  =  ( x  .x.  ( 2nd `  y ) ) )
2524oveqd 6295 . . . . . . . . 9  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
g ( x (comp `  c ) ( 2nd `  y ) ) h )  =  ( g ( x  .x.  ( 2nd `  y ) ) h ) )
26 eqidd 2403 . . . . . . . . 9  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  f  =  f )
2723, 25, 26oveq123d 6299 . . . . . . . 8  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
( g ( x (comp `  c )
( 2nd `  y
) ) h ) ( <. ( 1st `  y
) ,  ( 1st `  x ) >. (comp `  c ) ( 2nd `  y ) ) f )  =  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) )
2819, 27mpteq12dv 4473 . . . . . . 7  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) )  =  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) )
2917, 18, 28mpt2eq123dv 6340 . . . . . 6  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
f  e.  ( ( 1st `  y ) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) )  =  ( f  e.  ( ( 1st `  y ) H ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y ) )  |->  ( h  e.  ( H `  x
)  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) ( <.
( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) )
3012, 12, 29mpt2eq123dv 6340 . . . . 5  |-  ( ( ( ph  /\  c  =  C )  /\  b  =  B )  ->  (
x  e.  ( b  X.  b ) ,  y  e.  ( b  X.  b )  |->  ( f  e.  ( ( 1st `  y ) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) ) )  =  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B ) 
|->  ( f  e.  ( ( 1st `  y
) H ( 1st `  x ) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y
) )  |->  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) )
317, 10, 30csbied2 3401 . . . 4  |-  ( (
ph  /\  c  =  C )  ->  [_ ( Base `  c )  / 
b ]_ ( x  e.  ( b  X.  b
) ,  y  e.  ( b  X.  b
)  |->  ( f  e.  ( ( 1st `  y
) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) ) )  =  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B ) 
|->  ( f  e.  ( ( 1st `  y
) H ( 1st `  x ) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y
) )  |->  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) )
325, 31opeq12d 4167 . . 3  |-  ( (
ph  /\  c  =  C )  ->  <. ( Hom f  `  c ) ,  [_ ( Base `  c )  /  b ]_ (
x  e.  ( b  X.  b ) ,  y  e.  ( b  X.  b )  |->  ( f  e.  ( ( 1st `  y ) ( Hom  `  c
) ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) ( Hom  `  c ) ( 2nd `  y ) )  |->  ( h  e.  ( ( Hom  `  c ) `  x )  |->  ( ( g ( x (comp `  c ) ( 2nd `  y ) ) h ) ( <. ( 1st `  y ) ,  ( 1st `  x
) >. (comp `  c
) ( 2nd `  y
) ) f ) ) ) ) >.  =  <. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B
) ,  y  e.  ( B  X.  B
)  |->  ( f  e.  ( ( 1st `  y
) H ( 1st `  x ) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y
) )  |->  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >. )
33 hofval.c . . 3  |-  ( ph  ->  C  e.  Cat )
34 opex 4655 . . . 4  |-  <. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B )  |->  ( f  e.  ( ( 1st `  y ) H ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y ) )  |->  ( h  e.  ( H `  x
)  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) ( <.
( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >.  e.  _V
3534a1i 11 . . 3  |-  ( ph  -> 
<. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B ) 
|->  ( f  e.  ( ( 1st `  y
) H ( 1st `  x ) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y
) )  |->  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >.  e.  _V )
363, 32, 33, 35fvmptd 5938 . 2  |-  ( ph  ->  (HomF
`  C )  = 
<. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B ) 
|->  ( f  e.  ( ( 1st `  y
) H ( 1st `  x ) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y
) )  |->  ( h  e.  ( H `  x )  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) (
<. ( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >. )
371, 36syl5eq 2455 1  |-  ( ph  ->  M  =  <. ( Hom f  `  C ) ,  ( x  e.  ( B  X.  B ) ,  y  e.  ( B  X.  B )  |->  ( f  e.  ( ( 1st `  y ) H ( 1st `  x
) ) ,  g  e.  ( ( 2nd `  x ) H ( 2nd `  y ) )  |->  ( h  e.  ( H `  x
)  |->  ( ( g ( x  .x.  ( 2nd `  y ) ) h ) ( <.
( 1st `  y
) ,  ( 1st `  x ) >.  .x.  ( 2nd `  y ) ) f ) ) ) ) >. )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 367    = wceq 1405    e. wcel 1842   _Vcvv 3059   [_csb 3373   <.cop 3978    |-> cmpt 4453    X. cxp 4821   ` cfv 5569  (class class class)co 6278    |-> cmpt2 6280   1stc1st 6782   2ndc2nd 6783   Basecbs 14841   Hom chom 14920  compcco 14921   Catccat 15278   Hom f chomf 15280  HomFchof 15841
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-6 1771  ax-7 1814  ax-9 1846  ax-10 1861  ax-11 1866  ax-12 1878  ax-13 2026  ax-ext 2380  ax-sep 4517  ax-nul 4525  ax-pr 4630
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3an 976  df-tru 1408  df-ex 1634  df-nf 1638  df-sb 1764  df-eu 2242  df-mo 2243  df-clab 2388  df-cleq 2394  df-clel 2397  df-nfc 2552  df-ne 2600  df-ral 2759  df-rex 2760  df-rab 2763  df-v 3061  df-sbc 3278  df-csb 3374  df-dif 3417  df-un 3419  df-in 3421  df-ss 3428  df-nul 3739  df-if 3886  df-sn 3973  df-pr 3975  df-op 3979  df-uni 4192  df-br 4396  df-opab 4454  df-mpt 4455  df-id 4738  df-xp 4829  df-rel 4830  df-cnv 4831  df-co 4832  df-dm 4833  df-iota 5533  df-fun 5571  df-fv 5577  df-ov 6281  df-oprab 6282  df-mpt2 6283  df-hof 15843
This theorem is referenced by:  hof1fval  15846  hof2fval  15848  hofcl  15852  hofpropd  15860
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