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| Mirrors > Home > MPE Home > Th. List > f1eq2 | Structured version Visualization version GIF version | ||
| Description: Equality theorem for one-to-one functions. (Contributed by NM, 10-Feb-1997.) |
| Ref | Expression |
|---|---|
| f1eq2 | ⊢ (𝐴 = 𝐵 → (𝐹:𝐴–1-1→𝐶 ↔ 𝐹:𝐵–1-1→𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq2 6681 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶𝐶 ↔ 𝐹:𝐵⟶𝐶)) | |
| 2 | 1 | anbi1d 643 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹) ↔ (𝐹:𝐵⟶𝐶 ∧ Fun ◡𝐹))) |
| 3 | df-f1 6538 | . 2 ⊢ (𝐹:𝐴–1-1→𝐶 ↔ (𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹)) | |
| 4 | df-f1 6538 | . 2 ⊢ (𝐹:𝐵–1-1→𝐶 ↔ (𝐹:𝐵⟶𝐶 ∧ Fun ◡𝐹)) | |
| 5 | 2, 3, 4 | 3bitr4g 317 | 1 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴–1-1→𝐶 ↔ 𝐹:𝐵–1-1→𝐶)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ◡ccnv 5654 Fun wfun 6527 ⟶wf 6529 –1-1→wf1 6530 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-9 2155 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2752 df-fn 6536 df-f 6537 df-f1 6538 |
| This theorem is used by: f1co 6784 f1oeq2 6806 f1eq123d 6809 f10d 6852 brdom2g 8963 marypha1lem 9403 fseqenlem1 10027 dfac12lem2 10147 dfac12lem3 10148 ackbij2 10244 iundom2g 10548 hashf1 14522 ccatf1 14656 matunitlindflem2 22902 istrkg3ld 28802 ausgrusgrb 29625 usgr0 29703 uspgr1e 29704 usgrres 29768 usgrexilem 29900 usgr2pthlem 30228 usgr2pth 30229 s2f1 33389 cshf1o 33402 cycpmconjv 33582 cyc3evpm 33590 lindflbs 33812 eldioph2lem2 43606 f1cof1b 47965 fundcmpsurinj 48309 fundcmpsurbijinj 48310 fargshiftf1 48341 upgrimtrlslem2 48821 f102g 49780 f1mo 49781 aacllem 50772 |
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