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Theorem off2 27937
Description: The function operation produces a function - alternative form with all antecedents as deduction. (Contributed by Thierry Arnoux, 17-Feb-2017.)
Hypotheses
Ref Expression
off2.1  |-  ( (
ph  /\  ( x  e.  S  /\  y  e.  T ) )  -> 
( x R y )  e.  U )
off2.2  |-  ( ph  ->  F : A --> S )
off2.3  |-  ( ph  ->  G : B --> T )
off2.4  |-  ( ph  ->  A  e.  V )
off2.5  |-  ( ph  ->  B  e.  W )
off2.6  |-  ( ph  ->  ( A  i^i  B
)  =  C )
Assertion
Ref Expression
off2  |-  ( ph  ->  ( F  oF R G ) : C --> U )
Distinct variable groups:    y, G    x, y, ph    x, S, y   
x, T, y    x, F, y    x, R, y   
x, U, y
Allowed substitution hints:    A( x, y)    B( x, y)    C( x, y)    G( x)    V( x, y)    W( x, y)

Proof of Theorem off2
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 off2.2 . . . . . 6  |-  ( ph  ->  F : A --> S )
21adantr 465 . . . . 5  |-  ( (
ph  /\  z  e.  C )  ->  F : A --> S )
3 off2.6 . . . . . . 7  |-  ( ph  ->  ( A  i^i  B
)  =  C )
4 inss1 3661 . . . . . . 7  |-  ( A  i^i  B )  C_  A
53, 4syl6eqssr 3495 . . . . . 6  |-  ( ph  ->  C  C_  A )
65sselda 3444 . . . . 5  |-  ( (
ph  /\  z  e.  C )  ->  z  e.  A )
72, 6ffvelrnd 6012 . . . 4  |-  ( (
ph  /\  z  e.  C )  ->  ( F `  z )  e.  S )
8 off2.3 . . . . . 6  |-  ( ph  ->  G : B --> T )
98adantr 465 . . . . 5  |-  ( (
ph  /\  z  e.  C )  ->  G : B --> T )
10 inss2 3662 . . . . . . 7  |-  ( A  i^i  B )  C_  B
113, 10syl6eqssr 3495 . . . . . 6  |-  ( ph  ->  C  C_  B )
1211sselda 3444 . . . . 5  |-  ( (
ph  /\  z  e.  C )  ->  z  e.  B )
139, 12ffvelrnd 6012 . . . 4  |-  ( (
ph  /\  z  e.  C )  ->  ( G `  z )  e.  T )
14 off2.1 . . . . . 6  |-  ( (
ph  /\  ( x  e.  S  /\  y  e.  T ) )  -> 
( x R y )  e.  U )
1514ralrimivva 2827 . . . . 5  |-  ( ph  ->  A. x  e.  S  A. y  e.  T  ( x R y )  e.  U )
1615adantr 465 . . . 4  |-  ( (
ph  /\  z  e.  C )  ->  A. x  e.  S  A. y  e.  T  ( x R y )  e.  U )
17 ovrspc2v 6302 . . . 4  |-  ( ( ( ( F `  z )  e.  S  /\  ( G `  z
)  e.  T )  /\  A. x  e.  S  A. y  e.  T  ( x R y )  e.  U
)  ->  ( ( F `  z ) R ( G `  z ) )  e.  U )
187, 13, 16, 17syl21anc 1231 . . 3  |-  ( (
ph  /\  z  e.  C )  ->  (
( F `  z
) R ( G `
 z ) )  e.  U )
19 eqid 2404 . . 3  |-  ( z  e.  C  |->  ( ( F `  z ) R ( G `  z ) ) )  =  ( z  e.  C  |->  ( ( F `
 z ) R ( G `  z
) ) )
2018, 19fmptd 6035 . 2  |-  ( ph  ->  ( z  e.  C  |->  ( ( F `  z ) R ( G `  z ) ) ) : C --> U )
21 ffn 5716 . . . . . 6  |-  ( F : A --> S  ->  F  Fn  A )
221, 21syl 17 . . . . 5  |-  ( ph  ->  F  Fn  A )
23 ffn 5716 . . . . . 6  |-  ( G : B --> T  ->  G  Fn  B )
248, 23syl 17 . . . . 5  |-  ( ph  ->  G  Fn  B )
25 off2.4 . . . . 5  |-  ( ph  ->  A  e.  V )
26 off2.5 . . . . 5  |-  ( ph  ->  B  e.  W )
27 eqid 2404 . . . . 5  |-  ( A  i^i  B )  =  ( A  i^i  B
)
28 eqidd 2405 . . . . 5  |-  ( (
ph  /\  z  e.  A )  ->  ( F `  z )  =  ( F `  z ) )
29 eqidd 2405 . . . . 5  |-  ( (
ph  /\  z  e.  B )  ->  ( G `  z )  =  ( G `  z ) )
3022, 24, 25, 26, 27, 28, 29offval 6530 . . . 4  |-  ( ph  ->  ( F  oF R G )  =  ( z  e.  ( A  i^i  B ) 
|->  ( ( F `  z ) R ( G `  z ) ) ) )
313mpteq1d 4478 . . . 4  |-  ( ph  ->  ( z  e.  ( A  i^i  B ) 
|->  ( ( F `  z ) R ( G `  z ) ) )  =  ( z  e.  C  |->  ( ( F `  z
) R ( G `
 z ) ) ) )
3230, 31eqtrd 2445 . . 3  |-  ( ph  ->  ( F  oF R G )  =  ( z  e.  C  |->  ( ( F `  z ) R ( G `  z ) ) ) )
3332feq1d 5702 . 2  |-  ( ph  ->  ( ( F  oF R G ) : C --> U  <->  ( z  e.  C  |->  ( ( F `  z ) R ( G `  z ) ) ) : C --> U ) )
3420, 33mpbird 234 1  |-  ( ph  ->  ( F  oF R G ) : C --> U )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 369    = wceq 1407    e. wcel 1844   A.wral 2756    i^i cin 3415    |-> cmpt 4455    Fn wfn 5566   -->wf 5567   ` cfv 5571  (class class class)co 6280    oFcof 6521
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1641  ax-4 1654  ax-5 1727  ax-6 1773  ax-7 1816  ax-9 1848  ax-10 1863  ax-11 1868  ax-12 1880  ax-13 2028  ax-ext 2382  ax-rep 4509  ax-sep 4519  ax-nul 4527  ax-pr 4632
This theorem depends on definitions:  df-bi 187  df-or 370  df-an 371  df-3an 978  df-tru 1410  df-ex 1636  df-nf 1640  df-sb 1766  df-eu 2244  df-mo 2245  df-clab 2390  df-cleq 2396  df-clel 2399  df-nfc 2554  df-ne 2602  df-ral 2761  df-rex 2762  df-reu 2763  df-rab 2765  df-v 3063  df-sbc 3280  df-csb 3376  df-dif 3419  df-un 3421  df-in 3423  df-ss 3430  df-nul 3741  df-if 3888  df-sn 3975  df-pr 3977  df-op 3981  df-uni 4194  df-iun 4275  df-br 4398  df-opab 4456  df-mpt 4457  df-id 4740  df-xp 4831  df-rel 4832  df-cnv 4833  df-co 4834  df-dm 4835  df-rn 4836  df-res 4837  df-ima 4838  df-iota 5535  df-fun 5573  df-fn 5574  df-f 5575  df-f1 5576  df-fo 5577  df-f1o 5578  df-fv 5579  df-ov 6283  df-oprab 6284  df-mpt2 6285  df-of 6523
This theorem is referenced by: (None)
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