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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 4271 | . . 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 7399 | . . . . 5 ⊢ (¬ 𝐼 ∈ V → (𝐼𝑂𝑅) = ∅) |
| 7 | 4, 6 | eqtrid 2788 | . . . 4 ⊢ (¬ 𝐼 ∈ V → 𝑆 = ∅) |
| 8 | 7 | fveq1d 6833 | . . 3 ⊢ (¬ 𝐼 ∈ V → (𝑆‘𝑌) = (∅‘𝑌)) |
| 9 | 0fv 6872 | . . 3 ⊢ (∅‘𝑌) = ∅ | |
| 10 | 8, 9 | eqtrdi 2792 | . 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 1548 ∈ wcel 2121 Vcvv 3433 ∅c0 4264 dom cdm 5621 Rel wrel 5626 ‘cfv 6489 (class class class)co 7360 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-sep 5221 ax-nul 5231 ax-pr 5365 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4265 df-if 4458 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-br 5076 df-opab 5138 df-xp 5627 df-rel 5628 df-dm 5631 df-iota 6445 df-fv 6497 df-ov 7363 |
| This theorem is referenced by: ismhp 22132 mhprcl 22135 mhpmulcl 22141 mhppwdeg 22142 mhpaddcl 22143 mhpinvcl 22144 mhpvscacl 22146 mhpind 43059 evlsmhpvvval 43060 mhphf2 43063 mhphf3 43064 |
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