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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 9251. (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 6740 | . . . 4 ⊢ (𝐹:𝐴–1-1→𝐵 → dom 𝐹 = 𝐴) | |
| 2 | dmexg 7852 | . . . . 5 ⊢ (𝐹 ∈ 𝑉 → dom 𝐹 ∈ V) | |
| 3 | eleq1 2824 | . . . . . 6 ⊢ (𝐴 = dom 𝐹 → (𝐴 ∈ V ↔ dom 𝐹 ∈ V)) | |
| 4 | 3 | eqcoms 2744 | . . . . 5 ⊢ (dom 𝐹 = 𝐴 → (𝐴 ∈ V ↔ dom 𝐹 ∈ V)) |
| 5 | 2, 4 | imbitrrid 246 | . . . 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 407 | . 2 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐹:𝐴–1-1→𝐵) → 𝐴 ∈ V) |
| 8 | f1dmvrnfibi 9251 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐹:𝐴–1-1→𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin)) | |
| 9 | 7, 8 | sylancom 589 | 1 ⊢ ((𝐹 ∈ 𝑉 ∧ 𝐹:𝐴–1-1→𝐵) → (𝐹 ∈ Fin ↔ ran 𝐹 ∈ Fin)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 Vcvv 3429 dom cdm 5631 ran crn 5632 –1-1→wf1 6495 Fincfn 8893 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-om 7818 df-1st 7942 df-2nd 7943 df-1o 8405 df-en 8894 df-dom 8895 df-fin 8897 |
| This theorem is referenced by: negfi 12105 usgredgffibi 29393 |
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