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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 2121, df-clel 2814. (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 1934 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
| 3 | eq0 4278 | . 2 ⊢ (𝐴 = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) | |
| 4 | 2, 3 | sylibr 235 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∀wal 1545 = wceq 1547 ∈ wcel 2119 ∅c0 4261 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-9 2129 ax-ext 2711 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-dif 3886 df-nul 4262 |
| This theorem is referenced by: map0b 8821 disjen 9062 mapdom1 9070 pwxpndom2 10579 fzdisj 13496 smu01lem 16445 prmreclem5 16882 vdwap0 16938 natfval 17907 fucbas 17921 fuchom 17922 coafval 18022 efgval 19683 lsppratlem6 21145 lbsextlem4 21154 psrvscafval 21923 cfinufil 23911 ufinffr 23912 fin1aufil 23915 bldisj 24381 reconnlem1 24810 pcofval 24995 bcthlem5 25313 volfiniun 25532 fta1g 26153 fta1 26292 rpvmasum 27507 0ringprmidl 33532 0ringmon1p 33640 0ringirng 33873 unblimceq0 36813 bj-ab0 37261 bj-projval 37349 finxpnom 37763 ipo0 44892 ifr0 44893 limclner 46094 iineq0 49310 |
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