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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 5409 | . . 3 ⊢ (𝐹 = 𝐺 → (𝐹 Fn 𝐴 ↔ 𝐺 Fn 𝐴)) | |
| 2 | rneq 4951 | . . . 4 ⊢ (𝐹 = 𝐺 → ran 𝐹 = ran 𝐺) | |
| 3 | 2 | sseq1d 3253 | . . 3 ⊢ (𝐹 = 𝐺 → (ran 𝐹 ⊆ 𝐵 ↔ ran 𝐺 ⊆ 𝐵)) |
| 4 | 1, 3 | anbi12d 473 | . 2 ⊢ (𝐹 = 𝐺 → ((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵) ↔ (𝐺 Fn 𝐴 ∧ ran 𝐺 ⊆ 𝐵))) |
| 5 | df-f 5322 | . 2 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) | |
| 6 | df-f 5322 | . 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 1395 ⊆ wss 3197 ran crn 4720 Fn wfn 5313 ⟶wf 5314 |
| 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 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-fun 5320 df-fn 5321 df-f 5322 |
| This theorem is referenced by: feq1d 5460 feq1i 5466 f00 5519 f0bi 5520 f0dom0 5521 fconstg 5524 f1eq1 5528 fconst2g 5858 tfrcllemsucfn 6505 tfrcllemsucaccv 6506 tfrcllembxssdm 6508 tfrcllembfn 6509 tfrcllemex 6512 tfrcllemaccex 6513 tfrcllemres 6514 tfrcl 6516 elmapg 6816 ac6sfi 7068 updjud 7257 finomni 7315 exmidomni 7317 mkvprop 7333 1fv 10343 seqf1oglem2 10750 seqf1og 10751 iswrd 11081 isgrpinv 13595 isghm 13788 upxp 14954 txcn 14957 plyf 15419 dceqnconst 16458 dcapnconst 16459 |
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