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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 2115, df-clel 2808. (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 1928 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4299 | . 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 1539 = wceq 1541 ∈ wcel 2113 ∅c0 4282 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-9 2123 ax-ext 2705 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2712 df-cleq 2725 df-dif 3901 df-nul 4283 |
| This theorem is referenced by: map0b 8817 disjen 9058 mapdom1 9066 pwxpndom2 10567 fzdisj 13458 smu01lem 16403 prmreclem5 16839 vdwap0 16895 natfval 17864 fucbas 17878 fuchom 17879 coafval 17979 efgval 19637 lsppratlem6 21098 lbsextlem4 21107 psrvscafval 21895 cfinufil 23863 ufinffr 23864 fin1aufil 23867 bldisj 24333 reconnlem1 24762 pcofval 24957 bcthlem5 25275 volfiniun 25495 fta1g 26122 fta1 26263 rpvmasum 27484 0ringprmidl 33458 0ringmon1p 33566 0ringirng 33774 unblimceq0 36623 bj-ab0 37025 bj-projval 37113 finxpnom 37518 ipo0 44605 ifr0 44606 limclner 45811 iineq0 48981 |
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