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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 6693 | . . 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 6548 | . 2 ⊢ (𝐹:𝐴–1-1→𝐶 ↔ (𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹)) | |
| 4 | df-f1 6548 | . 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 1569 ◡ccnv 5650 Fun wfun 6537 ⟶wf 6539 –1-1→wf1 6540 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2752 df-fn 6546 df-f 6547 df-f1 6548 |
| This theorem is used by: f1co 6796 f1oeq2 6818 f1eq123d 6821 f10d 6864 brdom2g 8991 marypha1lem 9432 fseqenlem1 10110 dfac12lem2 10230 dfac12lem3 10231 ackbij2 10327 iundom2g 10631 hashf1 14609 ccatf1 14743 matunitlindflem2 23004 istrkg3ld 28932 ausgrusgrb 29755 usgr0 29833 uspgr1e 29834 usgrres 29898 usgrexilem 30030 usgr2pthlem 30358 usgr2pth 30359 s2f1 33560 cshf1o 33573 cycpmconjv 33753 cyc3evpm 33761 lindflbs 33984 eldioph2lem2 43881 f1cof1b 48255 fundcmpsurinj 48599 fundcmpsurbijinj 48600 fargshiftf1 48631 upgrimtrlslem2 49111 f102g 50071 f1mo 50072 aacllem 51122 |
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