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Theorem feq1 5459
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 5412 . . 3 (𝐹 = 𝐺 → (𝐹 Fn 𝐴𝐺 Fn 𝐴))
2 rneq 4954 . . . 4 (𝐹 = 𝐺 → ran 𝐹 = ran 𝐺)
32sseq1d 3253 . . 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 5325 . 2 (𝐹:𝐴𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹𝐵))
6 df-f 5325 . 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 1395  wss 3197  ran crn 4721   Fn wfn 5316  wf 5317
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-sn 3672  df-pr 3673  df-op 3675  df-br 4084  df-opab 4146  df-rel 4727  df-cnv 4728  df-co 4729  df-dm 4730  df-rn 4731  df-fun 5323  df-fn 5324  df-f 5325
This theorem is referenced by:  feq1d  5463  feq1i  5469  f00  5522  f0bi  5523  f0dom0  5524  fconstg  5527  f1eq1  5531  fconst2g  5861  tfrcllemsucfn  6510  tfrcllemsucaccv  6511  tfrcllembxssdm  6513  tfrcllembfn  6514  tfrcllemex  6517  tfrcllemaccex  6518  tfrcllemres  6519  tfrcl  6521  elmapg  6821  ac6sfi  7073  updjud  7265  finomni  7323  exmidomni  7325  mkvprop  7341  1fv  10352  seqf1oglem2  10759  seqf1og  10760  iswrd  11091  isgrpinv  13608  isghm  13801  upxp  14967  txcn  14970  plyf  15432  griedg0prc  16069  dceqnconst  16542  dcapnconst  16543
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