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Mirrors > Home > MPE Home > Th. List > f1ovv | Structured version Visualization version GIF version |
Description: The codomain/range of a 1-1 onto function is a set iff its domain is a set. (Contributed by AV, 21-Mar-2019.) |
Ref | Expression |
---|---|
f1ovv | ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐴 ∈ V ↔ 𝐵 ∈ V)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f1ofo 6792 | . . 3 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵) | |
2 | focdmex 7889 | . . 3 ⊢ (𝐴 ∈ V → (𝐹:𝐴–onto→𝐵 → 𝐵 ∈ V)) | |
3 | 1, 2 | syl5com 31 | . 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐴 ∈ V → 𝐵 ∈ V)) |
4 | f1of1 6784 | . . 3 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–1-1→𝐵) | |
5 | f1dmex 7890 | . . . 4 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐵 ∈ V) → 𝐴 ∈ V) | |
6 | 5 | ex 414 | . . 3 ⊢ (𝐹:𝐴–1-1→𝐵 → (𝐵 ∈ V → 𝐴 ∈ V)) |
7 | 4, 6 | syl 17 | . 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐵 ∈ V → 𝐴 ∈ V)) |
8 | 3, 7 | impbid 211 | 1 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → (𝐴 ∈ V ↔ 𝐵 ∈ V)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∈ wcel 2107 Vcvv 3444 –1-1→wf1 6494 –onto→wfo 6495 –1-1-onto→wf1o 6496 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5243 ax-sep 5257 ax-nul 5264 ax-pr 5385 ax-un 7673 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2941 df-ral 3062 df-rex 3071 df-reu 3353 df-rab 3407 df-v 3446 df-sbc 3741 df-csb 3857 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-nul 4284 df-if 4488 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4867 df-iun 4957 df-br 5107 df-opab 5169 df-mpt 5190 df-id 5532 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-iota 6449 df-fun 6499 df-fn 6500 df-f 6501 df-f1 6502 df-fo 6503 df-f1o 6504 df-fv 6505 |
This theorem is referenced by: fsetsnprcnex 45375 fsetprcnexALT 45382 uspgrex 46138 |
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