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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 2809, ax-8 2108. (Revised by Gino Giotto, 2-Sep-2024.) |
Ref | Expression |
---|---|
ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2731 | . 2 ⊢ ∅ = ∅ | |
2 | rzal 4471 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1541 ∀wral 3060 ∅c0 4287 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-9 2116 ax-ext 2702 |
This theorem depends on definitions: df-bi 206 df-an 397 df-tru 1544 df-fal 1554 df-ex 1782 df-sb 2068 df-clab 2709 df-cleq 2723 df-ral 3061 df-dif 3916 df-nul 4288 |
This theorem is referenced by: int0 4928 0iin 5029 po0 5567 so0 5586 mpt0 6648 naddrid 8634 ixp0x 8871 ac6sfi 9238 sup0riota 9410 infpssrlem4 10251 axdc3lem4 10398 0tsk 10700 uzsupss 12874 xrsupsslem 13236 xrinfmsslem 13237 xrsup0 13252 fsuppmapnn0fiubex 13907 swrd0 14558 swrdspsleq 14565 repswsymballbi 14680 cshw1 14722 rexfiuz 15244 lcmf0 16521 2prm 16579 0ssc 17737 0subcat 17738 drsdirfi 18208 0pos 18224 0posOLD 18225 mrelatglb0 18464 sgrp0b 18568 ga0 19092 psgnunilem3 19292 lbsexg 20684 ocv0 21118 mdetunilem9 22006 imasdsf1olem 23763 prdsxmslem2 23922 lebnumlem3 24363 cniccbdd 24862 ovolicc2lem4 24921 c1lip1 25398 ulm0 25787 istrkg2ld 27465 nbgr0vtx 28367 nbgr1vtx 28369 cplgr0 28436 cplgr1v 28441 wwlksn0s 28869 clwwlkn 29033 clwwlkn1 29048 0ewlk 29121 1ewlk 29122 0wlk 29123 0conngr 29199 frgr0v 29269 frgr0 29272 frgr1v 29278 1vwmgr 29283 chocnul 30333 locfinref 32511 esumnul 32736 derang0 33850 unt0 34369 fdc 36277 lub0N 37724 glb0N 37728 0psubN 38285 sticksstones11 40637 cantnfresb 41717 safesnsupfilb 41812 nla0002 41818 nla0003 41819 iso0 42709 fnchoice 43356 eliuniincex 43441 eliincex 43442 limcdm0 43979 2ffzoeq 45680 iccpartiltu 45734 iccpartigtl 45735 0mgm 46188 linds0 46666 0thincg 47190 |
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