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Mirrors > Home > MPE Home > Th. List > f1vrnfibi | Structured version Visualization version GIF version |
Description: A one-to-one function which is a set is finite if and only if its range is finite. See also f1dmvrnfibi 8882. (Contributed by AV, 10-Jan-2020.) |
Ref | Expression |
---|---|
f1vrnfibi | ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐹:𝐴–1-1→𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f1dm 6579 | . . . 4 ⊢ (𝐹:𝐴–1-1→𝐵 → dom 𝐹 = 𝐴) | |
2 | dmexg 7635 | . . . . 5 ⊢ (𝐹 ∈ 𝑉 → dom 𝐹 ∈ V) | |
3 | eleq1 2820 | . . . . . 6 ⊢ (𝐴 = dom 𝐹 → (𝐴 ∈ V ↔ dom 𝐹 ∈ V)) | |
4 | 3 | eqcoms 2746 | . . . . 5 ⊢ (dom 𝐹 = 𝐴 → (𝐴 ∈ V ↔ dom 𝐹 ∈ V)) |
5 | 2, 4 | syl5ibr 249 | . . . 4 ⊢ (dom 𝐹 = 𝐴 → (𝐹 ∈ 𝑉 → 𝐴 ∈ V)) |
6 | 1, 5 | syl 17 | . . 3 ⊢ (𝐹:𝐴–1-1→𝐵 → (𝐹 ∈ 𝑉 → 𝐴 ∈ V)) |
7 | 6 | impcom 411 | . 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐹:𝐴–1-1→𝐵) → 𝐴 ∈ V) |
8 | f1dmvrnfibi 8882 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐹:𝐴–1-1→𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin)) | |
9 | 7, 8 | sylancom 591 | 1 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐹:𝐴–1-1→𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1542 ∈ wcel 2113 Vcvv 3398 dom cdm 5526 ran crn 5527 –1-1→wf1 6337 Fincfn 8556 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1916 ax-6 1974 ax-7 2019 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2161 ax-12 2178 ax-ext 2710 ax-rep 5155 ax-sep 5168 ax-nul 5175 ax-pow 5233 ax-pr 5297 ax-un 7480 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-ral 3058 df-rex 3059 df-reu 3060 df-rab 3062 df-v 3400 df-sbc 3683 df-csb 3792 df-dif 3847 df-un 3849 df-in 3851 df-ss 3861 df-pss 3863 df-nul 4213 df-if 4416 df-pw 4491 df-sn 4518 df-pr 4520 df-tp 4522 df-op 4524 df-uni 4798 df-iun 4884 df-br 5032 df-opab 5094 df-mpt 5112 df-tr 5138 df-id 5430 df-eprel 5435 df-po 5443 df-so 5444 df-fr 5484 df-we 5486 df-xp 5532 df-rel 5533 df-cnv 5534 df-co 5535 df-dm 5536 df-rn 5537 df-res 5538 df-ima 5539 df-ord 6176 df-on 6177 df-lim 6178 df-suc 6179 df-iota 6298 df-fun 6342 df-fn 6343 df-f 6344 df-f1 6345 df-fo 6346 df-f1o 6347 df-fv 6348 df-om 7601 df-1st 7715 df-2nd 7716 df-1o 8132 df-er 8321 df-en 8557 df-dom 8558 df-fin 8560 |
This theorem is referenced by: negfi 11668 usgredgffibi 27266 |
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