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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 2116. (Revised by GG, 2-Sep-2024.) |
| Ref | Expression |
|---|---|
| ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2736 | . 2 ⊢ ∅ = ∅ | |
| 2 | rzal 4434 | . 2 ⊢ (∅ = ∅ → ∀𝑥 ∈ ∅ 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ∀wral 3051 ∅c0 4273 |
| 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 2708 |
| 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 2715 df-cleq 2728 df-ral 3052 df-dif 3892 df-nul 4274 |
| This theorem is referenced by: int0 4904 0iin 5006 po0 5556 so0 5577 mpt0 6640 naddrid 8619 ixp0x 8874 ac6sfi 9194 sup0riota 9379 infpssrlem4 10228 axdc3lem4 10375 0tsk 10678 uzsupss 12890 xrsupsslem 13259 xrinfmsslem 13260 xrsup0 13275 fsuppmapnn0fiubex 13954 swrd0 14621 swrdspsleq 14628 repswsymballbi 14742 cshw1 14784 rexfiuz 15310 lcmf0 16603 2prm 16661 0ssc 17804 0subcat 17805 drsdirfi 18271 0pos 18287 mrelatglb0 18527 s1chn 18586 chnub 18588 sgrp0b 18696 ga0 19273 psgnunilem3 19471 lbsexg 21162 ocv0 21657 mdetunilem9 22585 imasdsf1olem 24338 prdsxmslem2 24494 lebnumlem3 24930 cniccbdd 25428 ovolicc2lem4 25487 c1lip1 25964 ulm0 26356 rightge0 27813 precsexlem9 28207 onsbnd 28273 n0fincut 28347 zcuts 28399 twocut 28415 addhalfcut 28451 0reno 28488 istrkg2ld 28528 nbgr1vtx 29427 cplgr0 29494 cplgr1v 29499 wwlksn0s 29929 clwwlkn 30096 clwwlkn1 30111 0ewlk 30184 1ewlk 30185 0wlk 30186 0conngr 30262 frgr0v 30332 frgr0 30335 frgr1v 30341 1vwmgr 30346 chocnul 31399 locfinref 33985 esumnul 34192 derang0 35351 unt0 35893 fdc 38066 lub0N 39635 glb0N 39639 0psubN 40195 sticksstones11 42595 cantnfresb 43752 safesnsupfilb 43845 nla0002 43851 nla0003 43852 iso0 44734 fnchoice 45460 eliuniincex 45539 eliincex 45540 limcdm0 46048 2ffzoeq 47776 iccpartiltu 47882 iccpartigtl 47883 0mgm 48642 linds0 48941 0funcALT 49563 0thincg 49933 termolmd 50145 |
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