Theorem fveq1 5177

Description: Equality theorem for function value. (Contributed by NM, 29-Dec-1996.)

Assertion

Ref	Expression
fveq1	⊢ (𝐹 = 𝐺 → (𝐹‘𝐴) = (𝐺‘𝐴))

Proof of Theorem fveq1

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		breq 3766	. . 3 ⊢ (𝐹 = 𝐺 → (𝐴𝐹𝑥 ↔ 𝐴𝐺𝑥))
2	1	iotabidv 4888	. 2 ⊢ (𝐹 = 𝐺 → (℩𝑥𝐴𝐹𝑥) = (℩𝑥𝐴𝐺𝑥))
3		df-fv 4910	. 2 ⊢ (𝐹‘𝐴) = (℩𝑥𝐴𝐹𝑥)
4		df-fv 4910	. 2 ⊢ (𝐺‘𝐴) = (℩𝑥𝐴𝐺𝑥)
5	2, 3, 4	3eqtr4g 2097	1 ⊢ (𝐹 = 𝐺 → (𝐹‘𝐴) = (𝐺‘𝐴))

Syntax hints:   → wi 4   = wceq 1243   class class class wbr 3764  ℩cio 4865  ‘cfv 4902

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-rex 2312  df-uni 3581  df-br 3765  df-iota 4867  df-fv 4910

This theorem is referenced by:  fveq1i  5179  fveq1d  5180  fvmptdf  5258  fvmptdv2  5260  isoeq1  5441  oveq  5518  offval  5719  ofrfval  5720  offval3  5761  smoeq  5905  recseq  5921  tfr0  5937  tfrlemiex  5945  rdgeq1  5958  rdgivallem  5968  rdg0  5974  frec0g  5983  frecsuclem3  5990  frecsuc  5991  ac6sfi  6352  1fv  8996  iseqeq3  9216  shftvalg  9437  shftval4g  9438  clim  9802