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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 2145, df-clel 2838. (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 1957 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4304 | . 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 1568 = wceq 1570 ∈ wcel 2143 ∅c0 4286 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-9 2153 ax-ext 2735 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-dif 3908 df-nul 4287 |
| This theorem is referenced by: map0b 8877 disjen 9118 mapdom1 9126 pwxpndom2 10645 fzdisj 13575 smu01lem 16538 prmreclem5 16975 vdwap0 17031 natfval 18001 fucbas 18015 fuchom 18016 coafval 18116 efgval 19782 lsppratlem6 21276 lbsextlem4 21285 0ringprmidl 21477 psrvscafval 22098 cfinufil 24085 ufinffr 24086 fin1aufil 24089 bldisj 24555 reconnlem1 24984 pcofval 25169 bcthlem5 25487 volfiniun 25706 fta1g 26327 fta1 26469 rpvmasum 27690 0ringmon1p 33847 0ringirng 34079 unblimceq0 37096 bj-ab0 37543 bj-projval 37632 finxpnom 38047 ipo0 45158 ifr0 45159 limclner 46365 iineq0 49598 |
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