Theorem feq1i 5039

Description: Equality inference for functions. (Contributed by Paul Chapman, 22-Jun-2011.)

Hypothesis

Ref	Expression
feq1i.1	|- F = G

Assertion

Ref	Expression
feq1i	|- ( F : A --> B <-> G : A --> B )

Proof of Theorem feq1i

Step	Hyp	Ref	Expression
1		feq1i.1	. 2 |- F = G
2		feq1 5030	. 2 |- ( F = G -> ( F : A --> B <-> G : A --> B ) )
3	1, 2	ax-mp 7	1 |- ( F : A --> B <-> G : A --> B )

Syntax hints:   <-> wb 98   = wceq 1243   -->wf 4898

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-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-rel 4352  df-cnv 4353  df-co 4354  df-dm 4355  df-rn 4356  df-fun 4904  df-fn 4905  df-f 4906

This theorem is referenced by:  ftpg  5347  resqrexlemf  9605  ialgrf  9884