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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 2146, df-clel 2835. (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 1959 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4296 | . 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 1567 = wceq 1569 ∈ wcel 2144 ∅c0 4277 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-dif 4046 df-nul 4278 |
| This theorem is used by: map0b 8918 disjen 9160 mapdom1 9168 pwxpndom2 10757 fzdisj 13692 smu01lem 16664 prmreclem5 17107 vdwap0 17163 natfval 18133 fucbas 18147 fuchom 18148 coafval 18248 efgval 19940 lsppratlem6 21439 lbsextlem4 21448 0ringprmidl 21642 psrvscafval 22265 cfinufil 24256 ufinffr 24257 fin1aufil 24260 bldisj 24726 reconnlem1 25155 pcofval 25340 bcthlem5 25658 volfiniun 25877 fta1g 26497 fta1 26638 rpvmasum 27862 0ringmon1p 34139 0ringirng 34371 unblimceq0 37469 bj-ab0 37916 bj-projval 38005 finxpnom 38433 ipo0 45540 ifr0 45541 limclner 46769 iineq0 50039 |
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