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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 2143, 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 1946 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4300 | . 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 1557 = wceq 1559 ∈ wcel 2141 ∅c0 4283 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-9 2151 ax-ext 2733 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-dif 3905 df-nul 4284 |
| This theorem is referenced by: map0b 8859 disjen 9100 mapdom1 9108 pwxpndom2 10617 fzdisj 13550 smu01lem 16510 prmreclem5 16947 vdwap0 17003 natfval 17973 fucbas 17987 fuchom 17988 coafval 18088 efgval 19748 lsppratlem6 21210 lbsextlem4 21219 psrvscafval 21988 cfinufil 23976 ufinffr 23977 fin1aufil 23980 bldisj 24446 reconnlem1 24875 pcofval 25060 bcthlem5 25378 volfiniun 25597 fta1g 26218 fta1 26360 rpvmasum 27578 0ringprmidl 33597 0ringmon1p 33714 0ringirng 33947 unblimceq0 36906 bj-ab0 37354 bj-projval 37442 finxpnom 37856 ipo0 44985 ifr0 44986 limclner 46186 iineq0 49402 |
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