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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 2147. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4450 | . 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 3076 ∅c0 4279 |
| 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 1943 ax-6 2000 ax-7 2041 ax-9 2155 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-ral 3077 df-dif 3902 df-nul 4280 |
| This theorem is used by: int0 4922 0iin 5022 po0 5580 so0 5601 mpt0 6674 naddrid 8672 ixp0x 8933 ac6sfi 9254 sup0riota 9436 infpssrlem4 10308 axdc3lem4 10455 0tsk 10764 uzsupss 12989 xrsupsslem 13359 xrinfmsslem 13360 xrsup0 13375 fsuppmapnn0fiubex 14056 swrd0 14728 swrdspsleq 14735 repswsymballbi 14851 cshw1 14893 rexfiuz 15435 lcmf0 16724 2prm 16782 0ssc 17926 0subcat 17927 drsdirfi 18393 0pos 18409 mrelatglb0 18649 s1chn 18708 chnub 18710 sgrp0b 18830 ga0 19425 psgnunilem3 19623 lbsexg 21351 ocv0 21890 mdetunilem9 22842 imasdsf1olem 24599 prdsxmslem2 24755 lebnumlem3 25191 cniccbdd 25689 ovolicc2lem4 25748 c1lip1 26224 ulm0 26627 rightge0 28086 precsexlem9 28480 onsbnd 28546 n0fincut 28620 zcuts 28672 twocut 28688 addhalfcut 28724 0reno 28761 istrkg2ld 28801 nbgr1vtx 29818 cplgr0 29885 cplgr1v 29890 wwlksn0s 30329 clwwlkn 30496 clwwlkn1 30511 0ewlk 30584 1ewlk 30585 0wlk 30586 0conngr 30672 frgr0v 30742 frgr0 30745 frgr1v 30751 1vwmgr 30756 chocnul 31809 locfinref 34351 esumnul 34558 derang0 35748 unt0 36290 nmulr0 36775 fdc 38495 lub0N 40062 glb0N 40066 0psubN 40622 sticksstones11 43022 cantnfresb 44165 safesnsupfilb 44258 nla0002 44264 nla0003 44265 iso0 45131 fnchoice 45863 eliuniincex 45941 eliincex 45942 limcdm0 46448 2ffzoeq 48216 iccpartiltu 48322 iccpartigtl 48323 0mgm 49081 linds0 49395 0funcALT 50014 0thincg 50384 termolmd 50596 |
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