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| Mirrors > Home > MPE Home > Th. List > f1eq1 | Structured version Visualization version GIF version | ||
| Description: Equality theorem for one-to-one functions. (Contributed by NM, 10-Feb-1997.) |
| Ref | Expression |
|---|---|
| f1eq1 | ⊢ (𝐹 = 𝐺 → (𝐹:𝐴–1-1→𝐵 ↔ 𝐺:𝐴–1-1→𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | feq1 6680 | . . 3 ⊢ (𝐹 = 𝐺 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) | |
| 2 | cnveq 5853 | . . . 4 ⊢ (𝐹 = 𝐺 → ◡𝐹 = ◡𝐺) | |
| 3 | 2 | funeqd 6555 | . . 3 ⊢ (𝐹 = 𝐺 → (Fun ◡𝐹 ↔ Fun ◡𝐺)) |
| 4 | 1, 3 | anbi12d 644 | . 2 ⊢ (𝐹 = 𝐺 → ((𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹) ↔ (𝐺:𝐴⟶𝐵 ∧ Fun ◡𝐺))) |
| 5 | df-f1 6538 | . 2 ⊢ (𝐹:𝐴–1-1→𝐵 ↔ (𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹)) | |
| 6 | df-f1 6538 | . 2 ⊢ (𝐺:𝐴–1-1→𝐵 ↔ (𝐺:𝐴⟶𝐵 ∧ Fun ◡𝐺)) | |
| 7 | 4, 5, 6 | 3bitr4g 317 | 1 ⊢ (𝐹 = 𝐺 → (𝐹:𝐴–1-1→𝐵 ↔ 𝐺:𝐴–1-1→𝐵)) |
| 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-8 2147 ax-9 2155 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 |
| This theorem is used by: f1oeq1 6805 f1eq123d 6809 fo00 6854 f1prex 7285 f1iun 7941 tposf12 8249 oacomf1olem 8551 f1dom4g 8971 f1dom3g 8973 f1domg 8977 dom3d 9000 domtr 9013 0domg 9102 domssex2 9135 marypha1lem 9403 fseqenlem1 10027 dfac12lem2 10147 dfac12lem3 10148 ackbij2 10244 fin23lem28 10342 fin23lem32 10346 fin23lem34 10348 fin23lem35 10349 fin23lem41 10354 iundom2g 10548 pwfseqlem5 10672 hashf1lem1 14520 hashf1lem2 14521 hashf1 14522 4sqlem11 17047 injsubmefmnd 19006 conjsubgen 19378 sylow1lem2 19726 sylow2blem1 19747 hauspwpwf1 24213 oldfib 28642 istrkg2ld 28801 axlowdim 29418 sizusglecusg 29923 specval 32379 aciunf1lem 33135 zrhchr 34484 qqhre 34530 vonf1oonf1 35711 hashnexinj 42994 eldioph2lem2 43606 meadjiunlem 47293 fcoresf1b 47958 fundcmpsurbijinjpreimafv 48307 fundcmpsurinjpreimafv 48308 fundcmpsurinjimaid 48311 f1sn2g 49779 f102g 49780 |
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