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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 2147, df-clel 2836. (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 4297 | . 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 2145 ∅c0 4279 |
| 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 2155 ax-ext 2733 |
| 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 2740 df-cleq 2753 df-dif 3902 df-nul 4280 |
| This theorem is used by: map0b 8904 disjen 9146 mapdom1 9154 pwxpndom2 10743 fzdisj 13678 smu01lem 16648 prmreclem5 17091 vdwap0 17147 natfval 18117 fucbas 18131 fuchom 18132 coafval 18232 efgval 19924 lsppratlem6 21423 lbsextlem4 21432 0ringprmidl 21626 psrvscafval 22249 cfinufil 24240 ufinffr 24241 fin1aufil 24244 bldisj 24710 reconnlem1 25139 pcofval 25324 bcthlem5 25642 volfiniun 25861 fta1g 26481 fta1 26622 rpvmasum 27846 0ringmon1p 34082 0ringirng 34314 unblimceq0 37353 bj-ab0 37800 bj-projval 37889 finxpnom 38304 ipo0 45417 ifr0 45418 limclner 46630 iineq0 49899 |
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