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Theorem feq1 5472
Description: Equality theorem for functions. (Contributed by NM, 1-Aug-1994.)
Assertion
Ref Expression
feq1 (𝐹 = 𝐺 → (𝐹:𝐴𝐵𝐺:𝐴𝐵))

Proof of Theorem feq1
StepHypRef Expression
1 fneq1 5425 . . 3 (𝐹 = 𝐺 → (𝐹 Fn 𝐴𝐺 Fn 𝐴))
2 rneq 4965 . . . 4 (𝐹 = 𝐺 → ran 𝐹 = ran 𝐺)
32sseq1d 3257 . . 3 (𝐹 = 𝐺 → (ran 𝐹𝐵 ↔ ran 𝐺𝐵))
41, 3anbi12d 473 . 2 (𝐹 = 𝐺 → ((𝐹 Fn 𝐴 ∧ ran 𝐹𝐵) ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺𝐵)))
5 df-f 5337 . 2 (𝐹:𝐴𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹𝐵))
6 df-f 5337 . 2 (𝐺:𝐴𝐵 ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺𝐵))
74, 5, 63bitr4g 223 1 (𝐹 = 𝐺 → (𝐹:𝐴𝐵𝐺:𝐴𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1398  wss 3201  ran crn 4732   Fn wfn 5328  wf 5329
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-fun 5335  df-fn 5336  df-f 5337
This theorem is referenced by:  feq1d  5476  feq1i  5482  f00  5537  f0bi  5538  f0dom0  5539  fconstg  5542  f1eq1  5546  fconst2g  5877  tfrcllemsucfn  6562  tfrcllemsucaccv  6563  tfrcllembxssdm  6565  tfrcllembfn  6566  tfrcllemex  6569  tfrcllemaccex  6570  tfrcllemres  6571  tfrcl  6573  elmapg  6873  ac6sfi  7130  updjud  7324  finomni  7382  exmidomni  7384  mkvprop  7400  1fv  10417  seqf1oglem2  10826  seqf1og  10827  iswrd  11162  isgrpinv  13698  isghm  13891  upxp  15063  txcn  15066  plyf  15528  griedg0prc  16171  dceqnconst  16773  dcapnconst  16774
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