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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 6688 | . . 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 6545 | . 2 ⊢ (𝐹:𝐴–1-1→𝐶 ↔ (𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹)) | |
| 4 | df-f1 6545 | . 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 5662 Fun wfun 6534 ⟶wf 6536 –1-1→wf1 6537 |
| 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 2156 ax-ext 2737 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2757 df-fn 6543 df-f 6544 df-f1 6545 |
| This theorem is used by: f1co 6791 f1oeq2 6813 f1eq123d 6816 f10d 6859 brdom2g 8960 marypha1lem 9400 fseqenlem1 10024 dfac12lem2 10144 dfac12lem3 10145 ackbij2 10241 iundom2g 10539 hashf1 14512 ccatf1 14646 istrkg3ld 28781 ausgrusgrb 29573 usgr0 29651 uspgr1e 29652 usgrres 29716 usgrexilem 29848 usgr2pthlem 30176 usgr2pth 30177 s2f1 33333 cshf1o 33346 cycpmconjv 33526 cyc3evpm 33534 lindflbs 33756 matunitlindflem2 38325 eldioph2lem2 43550 f1cof1b 47872 fundcmpsurinj 48216 fundcmpsurbijinj 48217 fargshiftf1 48248 upgrimtrlslem2 48728 f102g 49687 f1mo 49688 aacllem 50678 |
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