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| Mirrors > Home > MPE Home > Th. List > eq0rdv | Structured version Visualization version GIF version | ||
| Description: Deduction for equality to the empty set. (Contributed by NM, 11-Jul-2014.) Avoid ax-8 2115, df-clel 2811. (Revised by GG, 6-Sep-2024.) |
| Ref | Expression |
|---|---|
| eq0rdv.1 | ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) |
| Ref | Expression |
|---|---|
| eq0rdv | ⊢ (𝜑 → 𝐴 = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eq0rdv.1 | . . 3 ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) | |
| 2 | 1 | alrimiv 1928 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4302 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 234 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∀wal 1539 = wceq 1541 ∈ wcel 2113 ∅c0 4285 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-9 2123 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-dif 3904 df-nul 4286 |
| This theorem is referenced by: map0b 8821 disjen 9062 mapdom1 9070 pwxpndom2 10576 fzdisj 13467 smu01lem 16412 prmreclem5 16848 vdwap0 16904 natfval 17873 fucbas 17887 fuchom 17888 coafval 17988 efgval 19646 lsppratlem6 21107 lbsextlem4 21116 psrvscafval 21904 cfinufil 23872 ufinffr 23873 fin1aufil 23876 bldisj 24342 reconnlem1 24771 pcofval 24966 bcthlem5 25284 volfiniun 25504 fta1g 26131 fta1 26272 rpvmasum 27493 0ringprmidl 33530 0ringmon1p 33638 0ringirng 33846 unblimceq0 36707 bj-ab0 37109 bj-projval 37197 finxpnom 37606 ipo0 44689 ifr0 44690 limclner 45895 iineq0 49065 |
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