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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 2839, ax-8 2149. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2763 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4453 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∀wral 3080 ∅c0 4281 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-ral 3081 df-dif 4050 df-nul 4282 |
| This theorem is used by: int0 4927 0iin 5027 po0 5583 so0 5604 mpt0 6711 naddrid 8731 ixp0x 8992 ac6sfi 9313 sup0riota 9495 infpssrlem4 10423 axdc3lem4 10570 0tsk 10879 uzsupss 13107 xrsupsslem 13477 xrinfmsslem 13478 xrsup0 13493 fsuppmapnn0fiubex 14175 swrd0 14850 swrdspsleq 14857 repswsymballbi 14973 cshw1 15015 rexfiuz 15559 lcmf0 16853 2prm 16911 0ssc 18062 0subcat 18063 drsdirfi 18529 0pos 18545 mrelatglb0 18785 s1chn 18844 chnub 18846 sgrp0b 18967 ga0 19563 psgnunilem3 19761 lbsexg 21493 ocv0 22038 mdetunilem9 22990 imasdsf1olem 24747 prdsxmslem2 24903 lebnumlem3 25339 cniccbdd 25837 ovolicc2lem4 25896 c1lip1 26372 ulm0 26775 rightge0 28264 precsexlem9 28658 onsbnd 28724 n0fincut 28798 zcuts 28850 twocut 28866 addhalfcut 28902 0reno 28939 istrkg2ld 28979 nbgr1vtx 29996 cplgr0 30063 cplgr1v 30068 wwlksn0s 30507 clwwlkn 30674 clwwlkn1 30689 0ewlk 30762 1ewlk 30763 0wlk 30764 0conngr 30850 frgr0v 30920 frgr0 30923 frgr1v 30929 1vwmgr 30934 chocnul 31987 locfinref 34584 esumnul 34791 derang0 36142 unt0 36691 nmulr0 37159 mh-inf3f1 37544 fdc 38945 lub0N 40512 glb0N 40516 0psubN 41072 sticksstones11 43472 cantnfresb 44587 safesnsupfilb 44680 nla0002 44686 nla0003 44687 iso0 45552 fnchoice 46320 eliuniincex 46397 eliincex 46398 limcdm0 46903 2ffzoeq 48671 iccpartiltu 48777 iccpartigtl 48778 0mgm 49536 linds0 49908 0funcALT 50534 0thincg 50924 termolmd 51184 |
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