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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 2149, df-clel 2839. (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 1962 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4300 | . 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 2147 ∅c0 4281 |
| 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 1945 ax-6 2002 ax-7 2043 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-dif 4050 df-nul 4282 |
| This theorem is used by: map0b 8949 disjen 9191 mapdom1 9199 pwxpndom2 10789 fzdisj 13725 smu01lem 16699 prmreclem5 17142 vdwap0 17198 natfval 18174 fucbas 18188 fuchom 18189 coafval 18289 efgval 19982 lsppratlem6 21481 lbsextlem4 21490 0ringprmidl 21684 psrvscafval 22311 cfinufil 24302 ufinffr 24303 fin1aufil 24306 bldisj 24772 reconnlem1 25201 pcofval 25386 bcthlem5 25704 volfiniun 25923 fta1g 26543 fta1 26684 rpvmasum 27910 0ringmon1p 34192 0ringirng 34432 unblimceq0 37588 bj-ab0 38035 bj-projval 38124 finxpnom 38592 ipo0 45692 ifr0 45693 limclner 46934 iineq0 50262 |
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