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| Mirrors > Home > ILE Home > Th. List > feq1 | GIF version | ||
| Description: Equality theorem for functions. (Contributed by NM, 1-Aug-1994.) |
| Ref | Expression |
|---|---|
| feq1 | ⊢ (𝐹 = 𝐺 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fneq1 5467 | . . 3 ⊢ (𝐹 = 𝐺 → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐴)) | |
| 2 | rneq 5007 | . . . 4 ⊢ (𝐹 = 𝐺 → ran 𝐹 = ran 𝐺) | |
| 3 | 2 | sseq1d 3277 | . . 3 ⊢ (𝐹 = 𝐺 → (ran 𝐹 ⊆ 𝐵 ↔ ran 𝐺 ⊆ 𝐵)) |
| 4 | 1, 3 | anbi12d 477 | . 2 ⊢ (𝐹 = 𝐺 → ((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵) ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺 ⊆ 𝐵))) |
| 5 | df-f 5379 | . 2 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) | |
| 6 | df-f 5379 | . 2 ⊢ (𝐺:𝐴⟶𝐵 ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺 ⊆ 𝐵)) | |
| 7 | 4, 5, 6 | 3bitr4g 223 | 1 ⊢ (𝐹 = 𝐺 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1402 ⊆ wss 3220 ran crn 4773 Fn wfn 5370 ⟶wf 5371 |
| 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 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3714 df-pr 3715 df-op 3717 df-br 4129 df-opab 4191 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-fun 5377 df-fn 5378 df-f 5379 |
| This theorem is referenced by: feq1d 5518 feq1i 5524 f00 5582 f0bi 5583 f0dom0 5584 fconstg 5587 f1eq1 5591 fconst2g 5924 tfrcllemsucfn 6618 tfrcllemsucaccv 6619 tfrcllembxssdm 6621 tfrcllembfn 6622 tfrcllemex 6625 tfrcllemaccex 6626 tfrcllemres 6627 tfrcl 6629 elmapg 6929 mapfset 6939 fsetsspwxp 6942 ac6sfi 7196 f1setfi 7311 updjud 7416 finomni 7474 exmidomni 7476 mkvprop 7492 1fv 10529 seqf1oglem2 10940 seqf1og 10941 iswrd 11289 isgrpinv 13842 isghm 14029 upxp 15356 txcn 15359 plyf 15821 griedg0prc 16474 dceqnconst 17084 dcapnconst 17085 |
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