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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 2840, ax-8 2148. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2765 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4457 | . 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 3081 ∅c0 4286 |
| 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 2156 ax-ext 2737 |
| 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 2744 df-cleq 2757 df-ral 3082 df-dif 3909 df-nul 4287 |
| This theorem is used by: int0 4929 0iin 5030 po0 5588 so0 5609 mpt0 6681 naddrid 8676 ixp0x 8930 ac6sfi 9251 sup0riota 9433 infpssrlem4 10305 axdc3lem4 10452 0tsk 10755 uzsupss 12980 xrsupsslem 13349 xrinfmsslem 13350 xrsup0 13365 fsuppmapnn0fiubex 14046 swrd0 14718 swrdspsleq 14725 repswsymballbi 14841 cshw1 14883 rexfiuz 15423 lcmf0 16714 2prm 16772 0ssc 17916 0subcat 17917 drsdirfi 18383 0pos 18399 mrelatglb0 18639 s1chn 18698 chnub 18700 sgrp0b 18818 ga0 19412 psgnunilem3 19610 lbsexg 21338 ocv0 21877 mdetunilem9 22827 imasdsf1olem 24581 prdsxmslem2 24737 lebnumlem3 25173 cniccbdd 25671 ovolicc2lem4 25730 c1lip1 26207 ulm0 26605 rightge0 28065 precsexlem9 28459 onsbnd 28525 n0fincut 28599 zcuts 28651 twocut 28667 addhalfcut 28703 0reno 28740 istrkg2ld 28780 nbgr1vtx 29766 cplgr0 29833 cplgr1v 29838 wwlksn0s 30277 clwwlkn 30444 clwwlkn1 30459 0ewlk 30532 1ewlk 30533 0wlk 30534 0conngr 30614 frgr0v 30684 frgr0 30687 frgr1v 30693 1vwmgr 30698 chocnul 31751 locfinref 34295 esumnul 34502 derang0 35698 unt0 36240 nmulr0 36724 fdc 38454 lub0N 40021 glb0N 40025 0psubN 40581 sticksstones11 42981 cantnfresb 44109 safesnsupfilb 44202 nla0002 44208 nla0003 44209 iso0 45075 fnchoice 45807 eliuniincex 45885 eliincex 45886 limcdm0 46392 2ffzoeq 48123 iccpartiltu 48229 iccpartigtl 48230 0mgm 48988 linds0 49302 0funcALT 49923 0thincg 50293 termolmd 50505 |
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