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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 2811, ax-8 2115. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2736 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4447 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ∀wral 3051 ∅c0 4285 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-9 2123 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-ral 3052 df-dif 3904 df-nul 4286 |
| This theorem is referenced by: int0 4917 0iin 5019 po0 5549 so0 5570 mpt0 6634 naddrid 8611 ixp0x 8864 ac6sfi 9184 sup0riota 9369 infpssrlem4 10216 axdc3lem4 10363 0tsk 10666 uzsupss 12853 xrsupsslem 13222 xrinfmsslem 13223 xrsup0 13238 fsuppmapnn0fiubex 13915 swrd0 14582 swrdspsleq 14589 repswsymballbi 14703 cshw1 14745 rexfiuz 15271 lcmf0 16561 2prm 16619 0ssc 17761 0subcat 17762 drsdirfi 18228 0pos 18244 mrelatglb0 18484 s1chn 18543 chnub 18545 sgrp0b 18653 ga0 19227 psgnunilem3 19425 lbsexg 21119 ocv0 21632 mdetunilem9 22564 imasdsf1olem 24317 prdsxmslem2 24473 lebnumlem3 24918 cniccbdd 25418 ovolicc2lem4 25477 c1lip1 25958 ulm0 26356 rightge0 27817 precsexlem9 28211 onsbnd 28277 n0fincut 28351 zcuts 28403 twocut 28419 addhalfcut 28455 0reno 28492 istrkg2ld 28532 nbgr1vtx 29431 cplgr0 29498 cplgr1v 29503 wwlksn0s 29934 clwwlkn 30101 clwwlkn1 30116 0ewlk 30189 1ewlk 30190 0wlk 30191 0conngr 30267 frgr0v 30337 frgr0 30340 frgr1v 30346 1vwmgr 30351 chocnul 31403 locfinref 33998 esumnul 34205 derang0 35363 unt0 35905 fdc 37946 lub0N 39449 glb0N 39453 0psubN 40009 sticksstones11 42410 cantnfresb 43566 safesnsupfilb 43659 nla0002 43665 nla0003 43666 iso0 44548 fnchoice 45274 eliuniincex 45353 eliincex 45354 limcdm0 45864 2ffzoeq 47573 iccpartiltu 47668 iccpartigtl 47669 0mgm 48412 linds0 48711 0funcALT 49333 0thincg 49703 termolmd 49915 |
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