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| Mirrors > Home > MPE Home > Th. List > ral0 | Structured version Visualization version GIF version | ||
| Description: Vacuous universal quantification is always true. (Contributed by NM, 20-Oct-2005.) Avoid df-clel 2838, ax-8 2145. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4455 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1570 ∀wral 3079 ∅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-ral 3080 df-dif 3908 df-nul 4287 |
| This theorem is referenced by: int0 4927 0iin 5028 po0 5586 so0 5607 mpt0 6677 naddrid 8666 ixp0x 8920 ac6sfi 9240 sup0riota 9422 infpssrlem4 10285 axdc3lem4 10432 0tsk 10735 uzsupss 12959 xrsupsslem 13328 xrinfmsslem 13329 xrsup0 13344 fsuppmapnn0fiubex 14024 swrd0 14692 swrdspsleq 14699 repswsymballbi 14813 cshw1 14855 rexfiuz 15395 lcmf0 16687 2prm 16745 0ssc 17889 0subcat 17890 drsdirfi 18356 0pos 18372 mrelatglb0 18612 s1chn 18671 chnub 18673 sgrp0b 18781 ga0 19363 psgnunilem3 19561 lbsexg 21288 ocv0 21827 mdetunilem9 22777 imasdsf1olem 24530 prdsxmslem2 24686 lebnumlem3 25122 cniccbdd 25620 ovolicc2lem4 25679 c1lip1 26156 ulm0 26554 rightge0 28014 precsexlem9 28408 onsbnd 28474 n0fincut 28548 zcuts 28600 twocut 28616 addhalfcut 28652 0reno 28689 istrkg2ld 28729 nbgr1vtx 29708 cplgr0 29775 cplgr1v 29780 wwlksn0s 30210 clwwlkn 30377 clwwlkn1 30392 0ewlk 30465 1ewlk 30466 0wlk 30467 0conngr 30543 frgr0v 30613 frgr0 30616 frgr1v 30622 1vwmgr 30627 chocnul 31680 locfinref 34231 esumnul 34438 derang0 35661 unt0 36203 nmulr0 36687 fdc 38396 lub0N 39963 glb0N 39967 0psubN 40523 sticksstones11 42923 cantnfresb 44051 safesnsupfilb 44144 nla0002 44150 nla0003 44151 iso0 45017 fnchoice 45749 eliuniincex 45827 eliincex 45828 limcdm0 46334 2ffzoeq 48065 iccpartiltu 48171 iccpartigtl 48172 0mgm 48931 linds0 49245 0funcALT 49866 0thincg 50236 termolmd 50448 |
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