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Mirrors > Home > MPE Home > Th. List > 0ss | Structured version Visualization version GIF version |
Description: The null set is a subset of any class. Part of Exercise 1 of [TakeutiZaring] p. 22. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
0ss | ⊢ ∅ ⊆ 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 4247 | . . 3 ⊢ ¬ 𝑥 ∈ ∅ | |
2 | 1 | pm2.21i 119 | . 2 ⊢ (𝑥 ∈ ∅ → 𝑥 ∈ 𝐴) |
3 | 2 | ssriv 3919 | 1 ⊢ ∅ ⊆ 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 ⊆ wss 3881 ∅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-v 3443 df-dif 3884 df-in 3888 df-ss 3898 df-nul 4244 |
This theorem is referenced by: ss0b 4305 0pss 4352 npss0 4353 ssdifeq0 4390 pwpw0 4706 sssn 4719 sspr 4726 sstp 4727 pwsnOLD 4793 uni0 4828 int0el 4869 0disj 5022 disjx0 5024 tr0 5147 al0ssb 5176 0elpw 5221 rel0 5636 0ima 5913 dmxpss 5995 dmsnopss 6038 on0eqel 6276 iotassuni 6303 fun0 6389 f0 6534 fvmptss 6757 fvmptss2 6770 funressn 6898 riotassuni 7133 frxp 7803 suppssdm 7826 suppun 7833 suppss 7843 suppssov1 7845 suppss2 7847 suppssfv 7849 oaword1 8161 oaword2 8162 omwordri 8181 oewordri 8201 oeworde 8202 nnaword1 8238 0domg 8628 fodomr 8652 pwdom 8653 php 8685 isinf 8715 finsschain 8815 fipwuni 8874 fipwss 8877 wdompwdom 9026 inf3lemd 9074 inf3lem1 9075 cantnfle 9118 tc0 9173 r1val1 9199 alephgeom 9493 infmap2 9629 cfub 9660 cf0 9662 cflecard 9664 cfle 9665 fin23lem16 9746 itunitc1 9831 ttukeylem6 9925 ttukeylem7 9926 canthwe 10062 wun0 10129 tsk0 10174 gruina 10229 grur1a 10230 uzssz 12252 xrsup0 12704 fzoss1 13059 fsuppmapnn0fiubex 13355 swrd00 13997 swrdlend 14006 repswswrd 14137 xptrrel 14331 relexpdmd 14395 relexprnd 14399 relexpfldd 14401 rtrclreclem4 14412 sum0 15070 fsumss 15074 fsumcvg3 15078 prod0 15289 0bits 15778 sadid1 15807 sadid2 15808 smu01lem 15824 smu01 15825 smu02 15826 lcmf0 15968 vdwmc2 16305 vdwlem13 16319 ramz2 16350 strfvss 16498 ressbasss 16548 ress0 16550 ismred2 16866 acsfn 16922 acsfn0 16923 0ssc 17099 fullfunc 17168 fthfunc 17169 mrelatglb0 17787 cntzssv 18450 symgsssg 18587 efgsfo 18857 dprdsn 19151 lsp0 19774 lss0v 19781 lspsnat 19910 lsppratlem3 19914 lbsexg 19929 evpmss 20275 ocv0 20366 ocvz 20367 css1 20379 resspsrbas 20653 mhp0cl 20797 psr1crng 20816 psr1assa 20817 psr1tos 20818 psr1bas2 20819 vr1cl2 20822 ply1lss 20825 ply1subrg 20826 psr1plusg 20851 psr1vsca 20852 psr1mulr 20853 psr1ring 20876 psr1lmod 20878 psr1sca 20879 0opn 21509 toponsspwpw 21527 basdif0 21558 baspartn 21559 0cld 21643 ntr0 21686 cmpfi 22013 refun0 22120 xkouni 22204 xkoccn 22224 alexsubALTlem2 22653 ptcmplem2 22658 tsmsfbas 22733 setsmstopn 23085 restmetu 23177 tngtopn 23256 iccntr 23426 xrge0gsumle 23438 xrge0tsms 23439 metdstri 23456 ovol0 24097 0mbl 24143 itg1le 24317 itgioo 24419 limcnlp 24481 dvbsss 24505 plyssc 24797 fsumharmonic 25597 egrsubgr 27067 0grsubgr 27068 0uhgrsubgr 27069 chocnul 29111 span0 29325 chsup0 29331 ssnnssfz 30536 xrge0tsmsd 30742 ddemeas 31605 dya2iocuni 31651 oms0 31665 0elcarsg 31675 eulerpartlemt 31739 bnj1143 32172 mrsubrn 32873 msubrn 32889 mthmpps 32942 dfpo2 33104 trpredlem1 33179 nulsslt 33375 nulssgt 33376 bj-nuliotaALT 34475 bj-restsn0 34500 bj-restsn10 34501 bj-imdirco 34605 pibt2 34834 mblfinlem2 35095 mblfinlem3 35096 ismblfin 35098 sstotbnd2 35212 isbnd3 35222 ssbnd 35226 heiborlem6 35254 lub0N 36485 glb0N 36489 0psubN 37045 padd01 37107 padd02 37108 pol0N 37205 pcl0N 37218 0psubclN 37239 mzpcompact2lem 39692 itgocn 40108 fvnonrel 40297 clcnvlem 40323 cnvrcl0 40325 cnvtrcl0 40326 0he 40483 ntrclskb 40772 gru0eld 40937 mnu0eld 40973 mnuprdlem4 40983 mnuprd 40984 founiiun0 41817 uzfissfz 41958 limcdm0 42260 cncfiooicc 42536 itgvol0 42610 ibliooicc 42613 ovn0 43205 sprssspr 43998 ssnn0ssfz 44751 setrec2fun 45222 |
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