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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 2814, ax-8 2121. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2739 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4422 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1547 ∀wral 3053 ∅c0 4261 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-9 2129 ax-ext 2711 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-ral 3054 df-dif 3886 df-nul 4262 |
| This theorem is referenced by: int0 4892 0iin 4993 po0 5543 so0 5564 mpt0 6627 naddrid 8609 ixp0x 8864 ac6sfi 9184 sup0riota 9369 infpssrlem4 10219 axdc3lem4 10366 0tsk 10669 uzsupss 12881 xrsupsslem 13250 xrinfmsslem 13251 xrsup0 13266 fsuppmapnn0fiubex 13945 swrd0 14612 swrdspsleq 14619 repswsymballbi 14733 cshw1 14775 rexfiuz 15301 lcmf0 16594 2prm 16652 0ssc 17795 0subcat 17796 drsdirfi 18262 0pos 18278 mrelatglb0 18518 s1chn 18577 chnub 18579 sgrp0b 18687 ga0 19264 psgnunilem3 19462 lbsexg 21157 ocv0 21652 mdetunilem9 22603 imasdsf1olem 24356 prdsxmslem2 24512 lebnumlem3 24948 cniccbdd 25446 ovolicc2lem4 25505 c1lip1 25982 ulm0 26374 rightge0 27831 precsexlem9 28225 onsbnd 28291 n0fincut 28365 zcuts 28417 twocut 28433 addhalfcut 28469 0reno 28506 istrkg2ld 28546 nbgr1vtx 29445 cplgr0 29512 cplgr1v 29517 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 34025 esumnul 34232 derang0 35397 unt0 35939 fdc 38112 lub0N 39681 glb0N 39685 0psubN 40241 sticksstones11 42641 cantnfresb 43769 safesnsupfilb 43862 nla0002 43868 nla0003 43869 iso0 44751 fnchoice 45477 eliuniincex 45556 eliincex 45557 limcdm0 46063 2ffzoeq 47791 iccpartiltu 47897 iccpartigtl 47898 0mgm 48657 linds0 48956 0funcALT 49578 0thincg 49948 termolmd 50160 |
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