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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 2116, df-clel 2811. (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 1929 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4290 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 234 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∀wal 1540 = wceq 1542 ∈ wcel 2114 ∅c0 4273 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-9 2124 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-dif 3892 df-nul 4274 |
| This theorem is referenced by: map0b 8831 disjen 9072 mapdom1 9080 pwxpndom2 10588 fzdisj 13505 smu01lem 16454 prmreclem5 16891 vdwap0 16947 natfval 17916 fucbas 17930 fuchom 17931 coafval 18031 efgval 19692 lsppratlem6 21150 lbsextlem4 21159 psrvscafval 21927 cfinufil 23893 ufinffr 23894 fin1aufil 23897 bldisj 24363 reconnlem1 24792 pcofval 24977 bcthlem5 25295 volfiniun 25514 fta1g 26135 fta1 26274 rpvmasum 27489 0ringprmidl 33509 0ringmon1p 33617 0ringirng 33833 unblimceq0 36767 bj-ab0 37215 bj-projval 37303 finxpnom 37717 ipo0 44875 ifr0 44876 limclner 46079 iineq0 49295 |
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