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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 2837, ax-8 2144. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2762 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4448 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1560 ∀wral 3076 ∅c0 4285 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-9 2152 ax-ext 2734 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1563 df-fal 1573 df-ex 1800 df-sb 2091 df-clab 2741 df-cleq 2754 df-ral 3077 df-dif 3907 df-nul 4286 |
| This theorem is referenced by: int0 4920 0iin 5021 po0 5572 so0 5593 mpt0 6663 naddrid 8654 ixp0x 8908 ac6sfi 9228 sup0riota 9412 infpssrlem4 10263 axdc3lem4 10410 0tsk 10713 uzsupss 12941 xrsupsslem 13310 xrinfmsslem 13311 xrsup0 13326 fsuppmapnn0fiubex 14005 swrd0 14672 swrdspsleq 14679 repswsymballbi 14793 cshw1 14835 rexfiuz 15375 lcmf0 16668 2prm 16726 0ssc 17870 0subcat 17871 drsdirfi 18337 0pos 18353 mrelatglb0 18593 s1chn 18652 chnub 18654 sgrp0b 18762 ga0 19338 psgnunilem3 19536 lbsexg 21231 ocv0 21726 mdetunilem9 22677 imasdsf1olem 24430 prdsxmslem2 24586 lebnumlem3 25022 cniccbdd 25520 ovolicc2lem4 25579 c1lip1 26056 ulm0 26451 rightge0 27911 precsexlem9 28305 onsbnd 28371 n0fincut 28445 zcuts 28497 twocut 28513 addhalfcut 28549 0reno 28586 istrkg2ld 28626 nbgr1vtx 29556 cplgr0 29623 cplgr1v 29628 wwlksn0s 30058 clwwlkn 30225 clwwlkn1 30240 0ewlk 30313 1ewlk 30314 0wlk 30315 0conngr 30391 frgr0v 30461 frgr0 30464 frgr1v 30470 1vwmgr 30475 chocnul 31528 locfinref 34135 esumnul 34342 derang0 35516 unt0 36058 nmulr0 36542 fdc 38241 lub0N 39810 glb0N 39814 0psubN 40370 sticksstones11 42770 cantnfresb 43898 safesnsupfilb 43991 nla0002 43997 nla0003 43998 iso0 44880 fnchoice 45606 eliuniincex 45684 eliincex 45685 limcdm0 46191 2ffzoeq 47919 iccpartiltu 48025 iccpartigtl 48026 0mgm 48785 linds0 49084 0funcALT 49706 0thincg 50076 termolmd 50288 |
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