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| Mirrors > Home > MPE Home > Th. List > f1oexrnex | Structured version Visualization version GIF version | ||
| Description: If the range of a 1-1 onto function is a set, the function itself is a set. (Contributed by AV, 2-Jun-2019.) |
| Ref | Expression |
|---|---|
| f1oexrnex | ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → 𝐹 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 486 | . . . 4 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → 𝐹:𝐴–1-1-onto→𝐵) | |
| 2 | f1ocnv 6814 | . . . 4 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → ◡𝐹:𝐵–1-1-onto→𝐴) | |
| 3 | f1of 6801 | . . . 4 ⊢ (◡𝐹:𝐵–1-1-onto→𝐴 → ◡𝐹:𝐵⟶𝐴) | |
| 4 | 1, 2, 3 | 3syl 18 | . . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → ◡𝐹:𝐵⟶𝐴) |
| 5 | fex 7205 | . . 3 ⊢ ((◡𝐹:𝐵⟶𝐴 ∧ 𝐵 ∈ 𝑉) → ◡𝐹 ∈ V) | |
| 6 | 4, 5 | sylancom 597 | . 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → ◡𝐹 ∈ V) |
| 7 | f1orel 6804 | . . . 4 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → Rel 𝐹) | |
| 8 | 7 | adantr 484 | . . 3 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → Rel 𝐹) |
| 9 | relcnvexb 7902 | . . 3 ⊢ (Rel 𝐹 → (𝐹 ∈ V ↔ ◡𝐹 ∈ V)) | |
| 10 | 8, 9 | syl 17 | . 2 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → (𝐹 ∈ V ↔ ◡𝐹 ∈ V)) |
| 11 | 6, 10 | mpbird 259 | 1 ⊢ ((𝐹:𝐴–1-1-onto→𝐵 ∧ 𝐵 ∈ 𝑉) → 𝐹 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 ∈ wcel 2141 Vcvv 3453 ◡ccnv 5642 Rel wrel 5648 ⟶wf 6512 –1-1-onto→wf1o 6515 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7713 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-id 5538 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-iota 6472 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 |
| This theorem is referenced by: gsumzf1o 19943 poimirlem3 38083 poimirlem24 38104 poimirlem25 38105 |
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