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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 2836, ax-8 2143. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2761 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4454 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1568 ∀wral 3077 ∅c0 4285 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-9 2151 ax-ext 2733 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1571 df-fal 1581 df-ex 1808 df-sb 2095 df-clab 2740 df-cleq 2753 df-ral 3078 df-dif 3907 df-nul 4286 |
| This theorem is referenced by: int0 4926 0iin 5027 po0 5586 so0 5607 mpt0 6677 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 21267 ocv0 21806 mdetunilem9 22756 imasdsf1olem 24509 prdsxmslem2 24665 lebnumlem3 25101 cniccbdd 25599 ovolicc2lem4 25658 c1lip1 26135 ulm0 26530 rightge0 27990 precsexlem9 28384 onsbnd 28450 n0fincut 28524 zcuts 28576 twocut 28592 addhalfcut 28628 0reno 28665 istrkg2ld 28705 nbgr1vtx 29674 cplgr0 29741 cplgr1v 29746 wwlksn0s 30176 clwwlkn 30343 clwwlkn1 30358 0ewlk 30431 1ewlk 30432 0wlk 30433 0conngr 30509 frgr0v 30579 frgr0 30582 frgr1v 30588 1vwmgr 30593 chocnul 31646 locfinref 34197 esumnul 34404 derang0 35615 unt0 36157 nmulr0 36641 fdc 38340 lub0N 39909 glb0N 39913 0psubN 40469 sticksstones11 42869 cantnfresb 43999 safesnsupfilb 44092 nla0002 44098 nla0003 44099 iso0 44965 fnchoice 45697 eliuniincex 45775 eliincex 45776 limcdm0 46282 2ffzoeq 48010 iccpartiltu 48116 iccpartigtl 48117 0mgm 48876 linds0 49190 0funcALT 49811 0thincg 50181 termolmd 50393 |
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