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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.) |
Ref | Expression |
---|---|
ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 4247 | . . 3 ⊢ ¬ 𝑥 ∈ ∅ | |
2 | 1 | pm2.21i 119 | . 2 ⊢ (𝑥 ∈ ∅ → 𝜑) |
3 | 2 | rgen 3116 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 ∀wral 3106 ∅c0 4243 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-ral 3111 df-dif 3884 df-nul 4244 |
This theorem is referenced by: int0 4852 0iin 4950 po0 5454 so0 5473 mpt0 6462 ixp0x 8473 ac6sfi 8746 sup0riota 8913 infpssrlem4 9717 axdc3lem4 9864 0tsk 10166 uzsupss 12328 xrsupsslem 12688 xrinfmsslem 12689 xrsup0 12704 fsuppmapnn0fiubex 13355 swrd0 14011 swrdspsleq 14018 repswsymballbi 14133 cshw1 14175 rexfiuz 14699 lcmf0 15968 2prm 16026 0ssc 17099 0subcat 17100 drsdirfi 17540 0pos 17556 mrelatglb0 17787 sgrp0b 17901 ga0 18420 psgnunilem3 18616 lbsexg 19929 ocv0 20366 mdetunilem9 21225 imasdsf1olem 22980 prdsxmslem2 23136 lebnumlem3 23568 cniccbdd 24065 ovolicc2lem4 24124 c1lip1 24600 ulm0 24986 istrkg2ld 26254 nbgr0vtx 27146 nbgr1vtx 27148 cplgr0 27215 cplgr1v 27220 wwlksn0s 27647 clwwlkn 27811 clwwlkn1 27826 0ewlk 27899 1ewlk 27900 0wlk 27901 0conngr 27977 frgr0v 28047 frgr0 28050 frgr1v 28056 1vwmgr 28061 chocnul 29111 locfinref 31194 esumnul 31417 derang0 32529 unt0 33050 nulsslt 33375 nulssgt 33376 fdc 35183 lub0N 36485 glb0N 36489 0psubN 37045 iso0 41011 fnchoice 41658 eliuniincex 41745 eliincex 41746 limcdm0 42260 2ffzoeq 43885 iccpartiltu 43939 iccpartigtl 43940 0mgm 44394 linds0 44874 |
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