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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 2148, df-clel 2840. (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 1960 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4304 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 237 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∀wal 1568 = wceq 1570 ∈ wcel 2146 ∅c0 4286 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-9 2156 ax-ext 2737 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2744 df-cleq 2757 df-dif 3909 df-nul 4287 |
| This theorem is used by: map0b 8887 disjen 9129 mapdom1 9137 pwxpndom2 10665 fzdisj 13596 smu01lem 16565 prmreclem5 17002 vdwap0 17058 natfval 18028 fucbas 18042 fuchom 18043 coafval 18143 efgval 19831 lsppratlem6 21326 lbsextlem4 21335 0ringprmidl 21527 psrvscafval 22148 cfinufil 24136 ufinffr 24137 fin1aufil 24140 bldisj 24606 reconnlem1 25035 pcofval 25220 bcthlem5 25538 volfiniun 25757 fta1g 26378 fta1 26520 rpvmasum 27741 0ringmon1p 33911 0ringirng 34143 unblimceq0 37153 bj-ab0 37600 bj-projval 37689 finxpnom 38104 ipo0 45216 ifr0 45217 limclner 46423 iineq0 49655 |
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