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Theorem feq1 5415
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 5368 . . 3 (𝐹 = 𝐺 → (𝐹 Fn 𝐴𝐺 Fn 𝐴))
2 rneq 4911 . . . 4 (𝐹 = 𝐺 → ran 𝐹 = ran 𝐺)
32sseq1d 3224 . . 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 5281 . 2 (𝐹:𝐴𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹𝐵))
6 df-f 5281 . 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 1373  wss 3168  ran crn 4681   Fn wfn 5272  wf 5273
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2188
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-v 2775  df-un 3172  df-in 3174  df-ss 3181  df-sn 3641  df-pr 3642  df-op 3644  df-br 4049  df-opab 4111  df-rel 4687  df-cnv 4688  df-co 4689  df-dm 4690  df-rn 4691  df-fun 5279  df-fn 5280  df-f 5281
This theorem is referenced by:  feq1d  5419  feq1i  5425  f00  5476  f0bi  5477  f0dom0  5478  fconstg  5481  f1eq1  5485  fconst2g  5809  tfrcllemsucfn  6449  tfrcllemsucaccv  6450  tfrcllembxssdm  6452  tfrcllembfn  6453  tfrcllemex  6456  tfrcllemaccex  6457  tfrcllemres  6458  tfrcl  6460  elmapg  6758  ac6sfi  7007  updjud  7196  finomni  7254  exmidomni  7256  mkvprop  7272  1fv  10274  seqf1oglem2  10678  seqf1og  10679  iswrd  11009  isgrpinv  13436  isghm  13629  upxp  14794  txcn  14797  plyf  15259  dceqnconst  16114  dcapnconst  16115
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