Theorem eqfnfvd 5783

Description: Deduction for equality of functions. (Contributed by Mario Carneiro, 24-Jul-2014.)

Hypotheses

Ref	Expression
eqfnfvd.1	|- ( ph -> F Fn A )
eqfnfvd.2	|- ( ph -> G Fn A )
eqfnfvd.3	|- ( ( ph /\ x e. A ) -> ( F ` x ) = ( G ` x ) )

Assertion

Ref	Expression
eqfnfvd	|- ( ph -> F = G )

Distinct variable groups:   x, A   x, F   x, G   ph, x

Proof of Theorem eqfnfvd

Step	Hyp	Ref	Expression
1		eqfnfvd.3	. . 3 |- ( ( ph /\ x e. A ) -> ( F ` x ) = ( G ` x ) )
2	1	ralrimiva 2617	. 2 |- ( ph -> A. x e. A ( F ` x ) = ( G ` x ) )
3		eqfnfvd.1	. . 3 |- ( ph -> F Fn A )
4		eqfnfvd.2	. . 3 |- ( ph -> G Fn A )
5		eqfnfv 5780	. . 3 |- ( ( F Fn A /\ G Fn A ) -> ( F = G <-> A. x e. A ( F ` x ) = ( G ` x ) ) )
6	3, 4, 5	syl2anc 411	. 2 |- ( ph -> ( F = G <-> A. x e. A ( F ` x ) = ( G ` x ) ) )
7	2, 6	mpbird 167	1 |- ( ph -> F = G )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1398   e. wcel 2205   A.wral 2522   Fn wfn 5352   ` cfv 5357

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3046  df-csb 3142  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-br 4115  df-opab 4177  df-mpt 4178  df-id 4419  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-iota 5317  df-fun 5359  df-fn 5360  df-fv 5365

This theorem is referenced by:  foeqcnvco  5969  f1eqcocnv  5970  offeq  6289  tfrlem1  6552  frecrdg  6652  updjudhcoinlf  7384  updjudhcoinrg  7385  nnnninfeq  7432  seq3val  10846  seqvalcd  10847  seq3feq2  10862  seq3feq  10866  seqfeq3  10915  ccatlid  11319  ccatrid  11320  ccatass  11321  ccatswrd  11387  swrdccat2  11388  pfxid  11403  ccatpfx  11418  pfxccat1  11419  swrdswrd  11422  cats1un  11438  swrdccatin1  11442  swrdccatin2  11446  pfxccatin12  11450  seq3shft  11548  efcvgfsum  12378  nninfctlemfo  12761  xpsfeq  13609  upxp  15263  uptx  15265  dvidlemap  15682  dvidrelem  15683  dvidsslem  15684  dvrecap  15704  depindlem3  16629  peano4nninf  16910  nninfsellemeqinf  16920  nninffeq  16924  refeq  16934