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Theorem funssfv 3735
Description: The value of a member of the domain of a subclass of a function.
Assertion
Ref Expression
funssfv |- ((Fun F /\ G (_ F /\ A e. dom G) -> (F` A) = (G` A))

Proof of Theorem funssfv
StepHypRef Expression
1 fvres 3734 . . . 4 |- (A e. dom G -> ((F |` dom G)` A) = (F` A))
21eqcomd 1480 . . 3 |- (A e. dom G -> (F` A) = ((F |` dom G)` A))
3 funssres 3552 . . . 4 |- ((Fun F /\ G (_ F) -> (F |` dom G) = G)
43fveq1d 3726 . . 3 |- ((Fun F /\ G (_ F) -> ((F |` dom G)` A) = (G` A))
52, 4sylan9eqr 1529 . 2 |- (((Fun F /\ G (_ F) /\ A e. dom G) -> (F` A) = (G` A))
653impa 828 1 |- ((Fun F /\ G (_ F /\ A e. dom G) -> (F` A) = (G` A))
Colors of variables: wff set class
Syntax hints:   -> wi 3   /\ wa 223   /\ w3a 775   = wceq 956   e. wcel 958   (_ wss 2047  dom cdm 3170   |` cres 3172  Fun wfun 3176  ` cfv 3182
This theorem is referenced by:  tfrlem9 3919  tfrlem11 3921  sspn 8395
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3an 777  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-cnv 3186  df-co 3187  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fun 3192  df-fv 3198
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