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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 4449 | . 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 4287 |
| 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 3906 df-nul 4288 |
| This theorem is referenced by: int0 4919 0iin 5021 po0 5557 so0 5578 mpt0 6642 naddrid 8621 ixp0x 8876 ac6sfi 9196 sup0riota 9381 infpssrlem4 10228 axdc3lem4 10375 0tsk 10678 uzsupss 12865 xrsupsslem 13234 xrinfmsslem 13235 xrsup0 13250 fsuppmapnn0fiubex 13927 swrd0 14594 swrdspsleq 14601 repswsymballbi 14715 cshw1 14757 rexfiuz 15283 lcmf0 16573 2prm 16631 0ssc 17773 0subcat 17774 drsdirfi 18240 0pos 18256 mrelatglb0 18496 s1chn 18555 chnub 18557 sgrp0b 18665 ga0 19239 psgnunilem3 19437 lbsexg 21131 ocv0 21644 mdetunilem9 22576 imasdsf1olem 24329 prdsxmslem2 24485 lebnumlem3 24930 cniccbdd 25430 ovolicc2lem4 25489 c1lip1 25970 ulm0 26368 rightge0 27829 precsexlem9 28223 onsbnd 28289 n0fincut 28363 zcuts 28415 twocut 28431 addhalfcut 28467 0reno 28504 istrkg2ld 28544 nbgr1vtx 29443 cplgr0 29510 cplgr1v 29515 wwlksn0s 29946 clwwlkn 30113 clwwlkn1 30128 0ewlk 30201 1ewlk 30202 0wlk 30203 0conngr 30279 frgr0v 30349 frgr0 30352 frgr1v 30358 1vwmgr 30363 chocnul 31416 locfinref 34019 esumnul 34226 derang0 35385 unt0 35927 fdc 37996 lub0N 39565 glb0N 39569 0psubN 40125 sticksstones11 42526 cantnfresb 43681 safesnsupfilb 43774 nla0002 43780 nla0003 43781 iso0 44663 fnchoice 45389 eliuniincex 45468 eliincex 45469 limcdm0 45978 2ffzoeq 47687 iccpartiltu 47782 iccpartigtl 47783 0mgm 48526 linds0 48825 0funcALT 49447 0thincg 49817 termolmd 50029 |
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