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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 4280 | . . 3 ⊢ (𝑋 ∈ (𝑆‘𝑌) → ¬ (𝑆‘𝑌) = ∅) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝜑 → ¬ (𝑆‘𝑌) = ∅) |
| 4 | elfvov1.s | . . . . 5 ⊢ 𝑆 = (𝐼𝑂𝑅) | |
| 5 | elfvov1.o | . . . . . 6 ⊢ Rel dom 𝑂 | |
| 6 | 5 | ovprc1 7406 | . . . . 5 ⊢ (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅) |
| 7 | 4, 6 | eqtrid 2783 | . . . 4 ⊢ (¬ 𝐼 ∈ V → 𝑆 = ∅) |
| 8 | 7 | fveq1d 6842 | . . 3 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌)) |
| 9 | 0fv 6881 | . . 3 ⊢ (∅‘𝑌) = ∅ | |
| 10 | 8, 9 | eqtrdi 2787 | . 2 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = ∅) |
| 11 | 3, 10 | nsyl2 141 | 1 ⊢ (𝜑 → 𝐼 ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1542 ∈ wcel 2114 Vcvv 3429 ∅c0 4273 dom cdm 5631 Rel wrel 5636 ‘cfv 6498 (class class class)co 7367 |
| 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-ext 2708 ax-sep 5231 ax-nul 5241 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-xp 5637 df-rel 5638 df-dm 5641 df-iota 6454 df-fv 6506 df-ov 7370 |
| This theorem is referenced by: ismhp 22106 mhprcl 22109 mhpmulcl 22115 mhppwdeg 22116 mhpaddcl 22117 mhpinvcl 22118 mhpvscacl 22120 mhpind 43027 evlsmhpvvval 43028 mhphf2 43031 mhphf3 43032 |
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