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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 4292 | . . 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 7451 | . . . . 5 ⊢ (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅) |
| 7 | 4, 6 | eqtrid 2809 | . . . 4 ⊢ (¬ 𝐼 ∈ V → 𝑆 = ∅) |
| 8 | 7 | fveq1d 6883 | . . 3 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌)) |
| 9 | 0fv 6922 | . . 3 ⊢ (∅‘𝑌) = ∅ | |
| 10 | 8, 9 | eqtrdi 2813 | . 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 1569 ∈ wcel 2142 Vcvv 3454 ∅c0 4285 dom cdm 5660 Rel wrel 5665 ‘cfv 6536 (class class class)co 7412 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pr 5403 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-opab 5173 df-xp 5666 df-rel 5667 df-dm 5670 df-iota 6492 df-fv 6544 df-ov 7415 |
| This theorem is used by: ismhp 22314 mhprcl 22317 mhpmulcl 22323 mhppwdeg 22324 mhpaddcl 22325 mhpinvcl 22326 mhpvscacl 22328 mhpind 43354 evlsmhpvvval 43355 mhphf2 43358 mhphf3 43359 |
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