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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 2134, df-clel 2827. (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 1937 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4293 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 236 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∀wal 1548 = wceq 1550 ∈ wcel 2132 ∅c0 4276 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-9 2142 ax-ext 2724 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-tru 1553 df-fal 1563 df-ex 1790 df-sb 2081 df-clab 2731 df-cleq 2744 df-dif 3898 df-nul 4277 |
| This theorem is referenced by: map0b 8850 disjen 9091 mapdom1 9099 pwxpndom2 10609 fzdisj 13542 smu01lem 16491 prmreclem5 16928 vdwap0 16984 natfval 17954 fucbas 17968 fuchom 17969 coafval 18069 efgval 19729 lsppratlem6 21191 lbsextlem4 21200 psrvscafval 21969 cfinufil 23957 ufinffr 23958 fin1aufil 23961 bldisj 24427 reconnlem1 24856 pcofval 25041 bcthlem5 25359 volfiniun 25578 fta1g 26199 fta1 26338 rpvmasum 27556 0ringprmidl 33581 0ringmon1p 33697 0ringirng 33930 unblimceq0 36883 bj-ab0 37331 bj-projval 37419 finxpnom 37833 ipo0 44962 ifr0 44963 limclner 46163 iineq0 49379 |
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