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Theorem fveqres 6923
Description: Equal values imply equal values in a restriction. (Contributed by NM, 13-Nov-1995.)
Assertion
Ref Expression
fveqres ((𝐹𝐴) = (𝐺𝐴) → ((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴))

Proof of Theorem fveqres
StepHypRef Expression
1 fvres 6898 . . . 4 (𝐴𝐵 → ((𝐹𝐵)‘𝐴) = (𝐹𝐴))
2 fvres 6898 . . . 4 (𝐴𝐵 → ((𝐺𝐵)‘𝐴) = (𝐺𝐴))
31, 2eqeq12d 2776 . . 3 (𝐴𝐵 → (((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴) ↔ (𝐹𝐴) = (𝐺𝐴)))
43biimprd 251 . 2 (𝐴𝐵 → ((𝐹𝐴) = (𝐺𝐴) → ((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴)))
5 nfvres 6917 . . . 4 𝐴𝐵 → ((𝐹𝐵)‘𝐴) = ∅)
6 nfvres 6917 . . . 4 𝐴𝐵 → ((𝐺𝐵)‘𝐴) = ∅)
75, 6eqtr4d 2798 . . 3 𝐴𝐵 → ((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴))
87a1d 26 . 2 𝐴𝐵 → ((𝐹𝐴) = (𝐺𝐴) → ((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴)))
94, 8pm2.61i 184 1 ((𝐹𝐴) = (𝐺𝐴) → ((𝐹𝐵)‘𝐴) = ((𝐺𝐵)‘𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wi 4   = wceq 1570  wcel 2145  c0 4279  cres 5657  cfv 6533
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-sep 5251  ax-nul 5263  ax-pr 5398
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-xp 5661  df-dm 5665  df-res 5667  df-iota 6489  df-fv 6541
This theorem is used by:  fvresex  7958
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