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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 2806, ax-8 2113. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2731 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4458 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ∀wral 3047 ∅c0 4282 |
| 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 2121 ax-ext 2703 |
| 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 2710 df-cleq 2723 df-ral 3048 df-dif 3900 df-nul 4283 |
| This theorem is referenced by: int0 4912 0iin 5014 po0 5544 so0 5565 mpt0 6629 naddrid 8604 ixp0x 8856 ac6sfi 9174 sup0riota 9356 infpssrlem4 10203 axdc3lem4 10350 0tsk 10652 uzsupss 12844 xrsupsslem 13212 xrinfmsslem 13213 xrsup0 13228 fsuppmapnn0fiubex 13905 swrd0 14572 swrdspsleq 14579 repswsymballbi 14693 cshw1 14735 rexfiuz 15261 lcmf0 16551 2prm 16609 0ssc 17750 0subcat 17751 drsdirfi 18217 0pos 18233 mrelatglb0 18473 s1chn 18532 chnub 18534 sgrp0b 18642 ga0 19216 psgnunilem3 19414 lbsexg 21107 ocv0 21620 mdetunilem9 22541 imasdsf1olem 24294 prdsxmslem2 24450 lebnumlem3 24895 cniccbdd 25395 ovolicc2lem4 25454 c1lip1 25935 ulm0 26333 rightpos 27788 precsexlem9 28159 n0sfincut 28288 zscut 28337 twocut 28352 addhalfcut 28385 istrkg2ld 28444 nbgr1vtx 29343 cplgr0 29410 cplgr1v 29415 wwlksn0s 29846 clwwlkn 30013 clwwlkn1 30028 0ewlk 30101 1ewlk 30102 0wlk 30103 0conngr 30179 frgr0v 30249 frgr0 30252 frgr1v 30258 1vwmgr 30263 chocnul 31315 locfinref 33861 esumnul 34068 derang0 35220 unt0 35762 fdc 37791 lub0N 39294 glb0N 39298 0psubN 39854 sticksstones11 42255 cantnfresb 43422 safesnsupfilb 43516 nla0002 43522 nla0003 43523 iso0 44405 fnchoice 45131 eliuniincex 45211 eliincex 45212 limcdm0 45723 2ffzoeq 47432 iccpartiltu 47527 iccpartigtl 47528 0mgm 48271 linds0 48571 0funcALT 49194 0thincg 49564 termolmd 49776 |
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