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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 6687 | . . 3 ⊢ (𝐹 = 𝐺 → (𝐹:𝐴⟶𝐵 ↔ 𝐺:𝐴⟶𝐵)) | |
| 2 | cnveq 5861 | . . . 4 ⊢ (𝐹 = 𝐺 → ◡𝐹 = ◡𝐺) | |
| 3 | 2 | funeqd 6562 | . . 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 6545 | . 2 ⊢ (𝐹:𝐴–1-1→𝐵 ↔ (𝐹:𝐴⟶𝐵 ∧ Fun ◡𝐹)) | |
| 6 | df-f1 6545 | . 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 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-8 2148 ax-9 2156 ax-ext 2737 |
| 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 2744 df-cleq 2757 df-clel 2840 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-br 5112 df-opab 5176 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 |
| This theorem is used by: f1oeq1 6812 f1eq123d 6816 fo00 6861 f1prex 7291 f1iun 7947 tposf12 8253 oacomf1olem 8555 f1dom4g 8968 f1dom3g 8970 f1domg 8974 dom3d 8997 domtr 9010 0domg 9099 domssex2 9132 marypha1lem 9400 fseqenlem1 10024 dfac12lem2 10144 dfac12lem3 10145 ackbij2 10241 fin23lem28 10339 fin23lem32 10343 fin23lem34 10345 fin23lem35 10346 fin23lem41 10351 iundom2g 10539 pwfseqlem5 10663 hashf1lem1 14510 hashf1lem2 14511 hashf1 14512 4sqlem11 17037 injsubmefmnd 18993 conjsubgen 19365 sylow1lem2 19713 sylow2blem1 19734 hauspwpwf1 24195 oldfib 28621 istrkg2ld 28780 axlowdim 29366 sizusglecusg 29871 specval 32321 aciunf1lem 33078 zrhchr 34428 qqhre 34474 vonf1oonf1 35655 hashnexinj 42953 eldioph2lem2 43550 meadjiunlem 47237 fcoresf1b 47865 fundcmpsurbijinjpreimafv 48214 fundcmpsurinjpreimafv 48215 fundcmpsurinjimaid 48218 f1sn2g 49686 f102g 49687 |
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