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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 2844, ax-8 2151. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2769 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4460 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1567 ∀wral 3085 ∅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-ral 3086 df-dif 3916 df-nul 4295 |
| This theorem is referenced by: int0 4931 0iin 5032 po0 5587 so0 5608 mpt0 6678 naddrid 8669 ixp0x 8923 ac6sfi 9243 sup0riota 9425 infpssrlem4 10289 axdc3lem4 10436 0tsk 10739 uzsupss 12963 xrsupsslem 13332 xrinfmsslem 13333 xrsup0 13348 fsuppmapnn0fiubex 14027 swrd0 14695 swrdspsleq 14702 repswsymballbi 14816 cshw1 14858 rexfiuz 15398 lcmf0 16691 2prm 16749 0ssc 17893 0subcat 17894 drsdirfi 18360 0pos 18376 mrelatglb0 18616 s1chn 18675 chnub 18677 sgrp0b 18785 ga0 19367 psgnunilem3 19565 lbsexg 21265 ocv0 21795 mdetunilem9 22745 imasdsf1olem 24498 prdsxmslem2 24654 lebnumlem3 25090 cniccbdd 25588 ovolicc2lem4 25647 c1lip1 26124 ulm0 26519 rightge0 27979 precsexlem9 28373 onsbnd 28439 n0fincut 28513 zcuts 28565 twocut 28581 addhalfcut 28617 0reno 28654 istrkg2ld 28694 nbgr1vtx 29648 cplgr0 29715 cplgr1v 29720 wwlksn0s 30150 clwwlkn 30317 clwwlkn1 30332 0ewlk 30405 1ewlk 30406 0wlk 30407 0conngr 30483 frgr0v 30553 frgr0 30556 frgr1v 30562 1vwmgr 30567 chocnul 31620 locfinref 34175 esumnul 34382 derang0 35559 unt0 36101 nmulr0 36585 fdc 38283 lub0N 39852 glb0N 39856 0psubN 40412 sticksstones11 42812 cantnfresb 43942 safesnsupfilb 44035 nla0002 44041 nla0003 44042 iso0 44908 fnchoice 45640 eliuniincex 45718 eliincex 45719 limcdm0 46225 2ffzoeq 47953 iccpartiltu 48059 iccpartigtl 48060 0mgm 48819 linds0 49129 0funcALT 49750 0thincg 50120 termolmd 50332 |
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