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Theorem feq1 5211
Description: Equality theorem for functions. (Contributed by set.mm contributors, 1-Aug-1994.)
Assertion
Ref Expression
feq1 (F = G → (F:A–→BG:A–→B))

Proof of Theorem feq1
StepHypRef Expression
1 fneq1 5174 . . 3 (F = G → (F Fn AG Fn A))
2 rneq 4957 . . . 4 (F = G → ran F = ran G)
32sseq1d 3299 . . 3 (F = G → (ran F B ↔ ran G B))
41, 3anbi12d 691 . 2 (F = G → ((F Fn A ran F B) ↔ (G Fn A ran G B)))
5 df-f 4792 . 2 (F:A–→B ↔ (F Fn A ran F B))
6 df-f 4792 . 2 (G:A–→B ↔ (G Fn A ran G B))
74, 5, 63bitr4g 279 1 (F = G → (F:A–→BG:A–→B))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 176   wa 358   = wceq 1642   wss 3258  ran crn 4774   Fn wfn 4777  –→wf 4778
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4079  ax-xp 4080  ax-cnv 4081  ax-1c 4082  ax-sset 4083  ax-si 4084  ax-ins2 4085  ax-ins3 4086  ax-typlower 4087  ax-sn 4088
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ne 2519  df-ral 2620  df-rex 2621  df-reu 2622  df-rmo 2623  df-rab 2624  df-v 2862  df-sbc 3048  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-symdif 3217  df-ss 3260  df-pss 3262  df-nul 3552  df-if 3664  df-pw 3725  df-sn 3742  df-pr 3743  df-uni 3893  df-int 3928  df-opk 4059  df-1c 4137  df-pw1 4138  df-uni1 4139  df-xpk 4186  df-cnvk 4187  df-ins2k 4188  df-ins3k 4189  df-imak 4190  df-cok 4191  df-p6 4192  df-sik 4193  df-ssetk 4194  df-imagek 4195  df-idk 4196  df-iota 4340  df-0c 4378  df-addc 4379  df-nnc 4380  df-fin 4381  df-lefin 4441  df-ltfin 4442  df-ncfin 4443  df-tfin 4444  df-evenfin 4445  df-oddfin 4446  df-sfin 4447  df-spfin 4448  df-phi 4566  df-op 4567  df-proj1 4568  df-proj2 4569  df-opab 4624  df-br 4641  df-co 4727  df-ima 4728  df-cnv 4786  df-rn 4787  df-dm 4788  df-fun 4790  df-fn 4791  df-f 4792
This theorem is referenced by:  feq1d  5215  feq1i  5218  elimf  5223  f00  5250  fconstg  5252  f1eq1  5254  fconst2g  5453  fconstfv  5457  elmapg  6013  map0  6026  mapsn  6027
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