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| Mirrors > Home > MPE Home > Th. List > elfvov1 | Structured version Visualization version GIF version | ||
| Description: Utility theorem: reverse closure for any operation that results in a function. (Contributed by SN, 18-May-2025.) |
| Ref | Expression |
|---|---|
| elfvov1.o | ⊢ Rel dom 𝑂 |
| elfvov1.s | ⊢ 𝑆 = (𝐼𝑂𝑅) |
| elfvov1.x | ⊢ (𝜑 → 𝑋 ∈ (𝑆‘𝑌)) |
| Ref | Expression |
|---|---|
| elfvov1 | ⊢ (𝜑 → 𝐼 ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elfvov1.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ (𝑆‘𝑌)) | |
| 2 | n0i 4285 | . . 3 ⊢ (𝑋 ∈ (𝑆‘𝑌) → ¬ (𝑆‘𝑌) = ∅) | |
| 3 | 1, 2 | syl 18 | . 2 ⊢ (𝜑 → ¬ (𝑆‘𝑌) = ∅) |
| 4 | elfvov1.s | . . . . 5 ⊢ 𝑆 = (𝐼𝑂𝑅) | |
| 5 | elfvov1.o | . . . . . 6 ⊢ Rel dom 𝑂 | |
| 6 | 5 | ovprc1 7447 | . . . . 5 ⊢ (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅) |
| 7 | 4, 6 | eqtrid 2807 | . . . 4 ⊢ (¬ 𝐼 ∈ V → 𝑆 = ∅) |
| 8 | 7 | fveq1d 6875 | . . 3 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌)) |
| 9 | 0fv 6914 | . . 3 ⊢ (∅‘𝑌) = ∅ | |
| 10 | 8, 9 | eqtrdi 2811 | . 2 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = ∅) |
| 11 | 3, 10 | nsyl2 142 | 1 ⊢ (𝜑 → 𝐼 ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1570 ∈ wcel 2145 Vcvv 3450 ∅c0 4278 dom cdm 5647 Rel wrel 5652 ‘cfv 6527 (class class class)co 7408 |
| 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 2147 ax-9 2155 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| 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-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5103 df-opab 5167 df-xp 5653 df-rel 5654 df-dm 5657 df-iota 6483 df-fv 6535 df-ov 7411 |
| This theorem is used by: ismhp 22422 mhprcl 22425 mhpmulcl 22431 mhppwdeg 22432 mhpaddcl 22433 mhpinvcl 22434 mhpvscacl 22436 mhpind 43544 evlsmhpvvval 43545 mhphf2 43548 mhphf3 43549 |
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