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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 2812, ax-8 2116. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2737 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4435 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∀wral 3052 ∅c0 4274 |
| 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 1912 ax-6 1969 ax-7 2010 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-ral 3053 df-dif 3893 df-nul 4275 |
| This theorem is referenced by: int0 4905 0iin 5007 po0 5550 so0 5571 mpt0 6635 naddrid 8613 ixp0x 8868 ac6sfi 9188 sup0riota 9373 infpssrlem4 10222 axdc3lem4 10369 0tsk 10672 uzsupss 12884 xrsupsslem 13253 xrinfmsslem 13254 xrsup0 13269 fsuppmapnn0fiubex 13948 swrd0 14615 swrdspsleq 14622 repswsymballbi 14736 cshw1 14778 rexfiuz 15304 lcmf0 16597 2prm 16655 0ssc 17798 0subcat 17799 drsdirfi 18265 0pos 18281 mrelatglb0 18521 s1chn 18580 chnub 18582 sgrp0b 18690 ga0 19267 psgnunilem3 19465 lbsexg 21157 ocv0 21670 mdetunilem9 22598 imasdsf1olem 24351 prdsxmslem2 24507 lebnumlem3 24943 cniccbdd 25441 ovolicc2lem4 25500 c1lip1 25977 ulm0 26372 rightge0 27830 precsexlem9 28224 onsbnd 28290 n0fincut 28364 zcuts 28416 twocut 28432 addhalfcut 28468 0reno 28505 istrkg2ld 28545 nbgr1vtx 29444 cplgr0 29511 cplgr1v 29516 wwlksn0s 29947 clwwlkn 30114 clwwlkn1 30129 0ewlk 30202 1ewlk 30203 0wlk 30204 0conngr 30280 frgr0v 30350 frgr0 30353 frgr1v 30359 1vwmgr 30364 chocnul 31417 locfinref 34004 esumnul 34211 derang0 35370 unt0 35912 fdc 38083 lub0N 39652 glb0N 39656 0psubN 40212 sticksstones11 42612 cantnfresb 43773 safesnsupfilb 43866 nla0002 43872 nla0003 43873 iso0 44755 fnchoice 45481 eliuniincex 45560 eliincex 45561 limcdm0 46069 2ffzoeq 47791 iccpartiltu 47897 iccpartigtl 47898 0mgm 48657 linds0 48956 0funcALT 49578 0thincg 49948 termolmd 50160 |
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