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Mirrors > Home > MPE Home > Th. List > snss | Structured version Visualization version GIF version |
Description: The singleton of an element of a class is a subset of the class (inference form of snssg 4678). Theorem 7.4 of [Quine] p. 49. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
snss.1 | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
snss | ⊢ (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snss.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | snssg 4678 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∈ wcel 2111 Vcvv 3441 ⊆ wss 3881 {csn 4525 |
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-12 2175 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-3an 1086 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-in 3888 df-ss 3898 df-sn 4526 |
This theorem is referenced by: tpss 4728 snelpw 5303 sspwb 5307 nnullss 5319 exss 5320 pwssun 5421 fvimacnvi 6799 fvimacnv 6800 fvimacnvALT 6804 fnressn 6897 limensuci 8677 domunfican 8775 finsschain 8815 epfrs 9157 tc2 9168 tcsni 9169 dju1dif 9583 fpwwe2lem13 10053 wunfi 10132 uniwun 10151 un0mulcl 11919 nn0ssz 11991 xrinfmss 12691 hashbclem 13806 hashf1lem1 13809 hashf1lem2 13810 fsum2dlem 15117 fsumabs 15148 fsumrlim 15158 fsumo1 15159 fsumiun 15168 incexclem 15183 fprod2dlem 15326 lcmfunsnlem 15975 lcmfun 15979 coprmprod 15995 coprmproddvdslem 15996 ramcl2 16342 0ram 16346 strfv 16523 imasaddfnlem 16793 imasaddvallem 16794 acsfn1 16924 drsdirfi 17540 sylow2a 18736 gsumpt 19075 dprdfadd 19135 ablfac1eulem 19187 pgpfaclem1 19196 acsfn1p 19571 rsp1 19990 mplcoe1 20705 mplcoe5 20708 mdetunilem9 21225 opnnei 21725 iscnp4 21868 cnpnei 21869 hausnei2 21958 fiuncmp 22009 llycmpkgen2 22155 1stckgen 22159 ptbasfi 22186 xkoccn 22224 xkoptsub 22259 ptcmpfi 22418 cnextcn 22672 tsmsid 22745 ustuqtop3 22849 utopreg 22858 prdsdsf 22974 prdsmet 22977 prdsbl 23098 fsumcn 23475 itgfsum 24430 dvmptfsum 24578 elply2 24793 elplyd 24799 ply1term 24801 ply0 24805 plymullem 24813 jensenlem1 25572 jensenlem2 25573 frcond3 28054 h1de2bi 29337 spansni 29340 gsumle 30775 gsumvsca1 30904 gsumvsca2 30905 extdg1id 31141 ordtconnlem1 31277 cntnevol 31597 eulerpartgbij 31740 breprexpnat 32015 cvmlift2lem1 32662 cvmlift2lem12 32674 dfon2lem7 33147 bj-tagss 34416 lindsenlbs 35052 matunitlindflem1 35053 divrngidl 35466 isfldidl 35506 ispridlc 35508 pclfinclN 37246 osumcllem10N 37261 pexmidlem7N 37272 clsk1indlem4 40747 clsk1indlem1 40748 fourierdlem62 42810 |
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