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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⟶1-1𝐶 ↔ 𝐹:𝐵⟶1-1𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq2 6718 | . . 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 6571 | . 2 ⊢ (𝐹:𝐴⟶1-1𝐶 ↔ (𝐹:𝐴⟶𝐶 ∧ Fun ◡𝐹)) | |
| 4 | df-f1 6571 | . 2 ⊢ (𝐹:𝐵⟶1-1𝐶 ↔ (𝐹:𝐵⟶𝐶 ∧ Fun ◡𝐹)) | |
| 5 | 2, 3, 4 | 3bitr4g 317 | 1 ⊢ (𝐴 = 𝐵 → (𝐹:𝐴⟶1-1𝐶 ↔ 𝐹:𝐵⟶1-1𝐶)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ◡ccnv 5657 Fun wfun 6560 ⟶wf 6562 ⟶1-1wf1 6563 |
| 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 1945 ax-6 2002 ax-7 2043 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2755 df-fn 6569 df-f 6570 df-f1 6571 |
| This theorem is used by: f1co 6821 f1oeq2 6843 f1eq123d 6846 f10d 6890 brdom2g 9022 marypha1lem 9462 fseqenlem1 10142 dfac12lem2 10262 dfac12lem3 10263 ackbij2 10359 iundom2g 10663 hashf1 14643 ccatf1 14777 matunitlindflem2 23050 istrkg3ld 28980 ausgrusgrb 29803 usgr0 29881 uspgr1e 29882 usgrres 29946 usgrexilem 30078 usgr2pthlem 30406 usgr2pth 30407 s2f1 33606 cshf1o 33619 cycpmconjv 33802 cyc3evpm 33810 lindflbs 34038 eldioph2lem2 44038 f1cof1b 48420 fundcmpsurinj 48764 fundcmpsurbijinj 48765 fargshiftf1 48796 upgrimtrlslem2 49276 f102g 50294 f1mo 50295 aacllem 51367 |
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