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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 2835, ax-8 2146. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4449 | . 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 1569 ∀wral 3076 ∅c0 4277 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-ral 3077 df-dif 4046 df-nul 4278 |
| This theorem is used by: int0 4921 0iin 5021 po0 5576 so0 5597 mpt0 6686 naddrid 8700 ixp0x 8961 ac6sfi 9282 sup0riota 9465 infpssrlem4 10391 axdc3lem4 10538 0tsk 10847 uzsupss 13074 xrsupsslem 13444 xrinfmsslem 13445 xrsup0 13460 fsuppmapnn0fiubex 14142 swrd0 14816 swrdspsleq 14823 repswsymballbi 14939 cshw1 14981 rexfiuz 15524 lcmf0 16818 2prm 16876 0ssc 18021 0subcat 18022 drsdirfi 18488 0pos 18504 mrelatglb0 18744 s1chn 18803 chnub 18805 sgrp0b 18926 ga0 19521 psgnunilem3 19719 lbsexg 21451 ocv0 21992 mdetunilem9 22944 imasdsf1olem 24701 prdsxmslem2 24857 lebnumlem3 25293 cniccbdd 25791 ovolicc2lem4 25850 c1lip1 26326 ulm0 26727 rightge0 28216 precsexlem9 28610 onsbnd 28676 n0fincut 28750 zcuts 28802 twocut 28818 addhalfcut 28854 0reno 28891 istrkg2ld 28931 nbgr1vtx 29948 cplgr0 30015 cplgr1v 30020 wwlksn0s 30459 clwwlkn 30626 clwwlkn1 30641 0ewlk 30714 1ewlk 30715 0wlk 30716 0conngr 30802 frgr0v 30872 frgr0 30875 frgr1v 30881 1vwmgr 30886 chocnul 31939 locfinref 34523 esumnul 34730 derang0 36024 unt0 36572 nmulr0 37040 mh-inf3f1 37425 fdc 38788 lub0N 40355 glb0N 40359 0psubN 40915 sticksstones11 43315 cantnfresb 44435 safesnsupfilb 44528 nla0002 44534 nla0003 44535 iso0 45400 fnchoice 46154 eliuniincex 46232 eliincex 46233 limcdm0 46738 2ffzoeq 48506 iccpartiltu 48612 iccpartigtl 48613 0mgm 49371 linds0 49685 0funcALT 50311 0thincg 50701 termolmd 50961 |
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