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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 2812. (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 4291 | . 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 4274 |
| 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 2709 |
| 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 2716 df-cleq 2729 df-dif 3893 df-nul 4275 |
| This theorem is referenced by: map0b 8824 disjen 9065 mapdom1 9073 pwxpndom2 10579 fzdisj 13496 smu01lem 16445 prmreclem5 16882 vdwap0 16938 natfval 17907 fucbas 17921 fuchom 17922 coafval 18022 efgval 19683 lsppratlem6 21142 lbsextlem4 21151 psrvscafval 21937 cfinufil 23903 ufinffr 23904 fin1aufil 23907 bldisj 24373 reconnlem1 24802 pcofval 24987 bcthlem5 25305 volfiniun 25524 fta1g 26145 fta1 26285 rpvmasum 27503 0ringprmidl 33524 0ringmon1p 33632 0ringirng 33849 unblimceq0 36783 bj-ab0 37231 bj-projval 37319 finxpnom 37731 ipo0 44893 ifr0 44894 limclner 46097 iineq0 49307 |
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