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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 2151, df-clel 2844. (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 1954 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4311 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 237 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∀wal 1565 = wceq 1567 ∈ wcel 2149 ∅c0 4294 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-dif 3916 df-nul 4295 |
| This theorem is referenced by: map0b 8877 disjen 9118 mapdom1 9126 pwxpndom2 10646 fzdisj 13575 smu01lem 16539 prmreclem5 16976 vdwap0 17032 natfval 18002 fucbas 18016 fuchom 18017 coafval 18117 efgval 19783 lsppratlem6 21250 lbsextlem4 21259 0ringprmidl 21442 psrvscafval 22063 cfinufil 24050 ufinffr 24051 fin1aufil 24054 bldisj 24520 reconnlem1 24949 pcofval 25134 bcthlem5 25452 volfiniun 25671 fta1g 26292 fta1 26434 rpvmasum 27652 0ringmon1p 33788 0ringirng 34020 unblimceq0 36981 bj-ab0 37428 bj-projval 37516 finxpnom 37930 ipo0 45045 ifr0 45046 limclner 46252 iineq0 49478 |
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