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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 4717). 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 4717 | . 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 208 ∈ wcel 2114 Vcvv 3494 ⊆ wss 3936 {csn 4567 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-in 3943 df-ss 3952 df-sn 4568 |
This theorem is referenced by: tpss 4768 snelpw 5338 sspwb 5342 nnullss 5354 exss 5355 pwssun 5456 fvimacnvi 6822 fvimacnv 6823 fvimacnvALT 6827 fnressn 6920 limensuci 8693 domunfican 8791 finsschain 8831 epfrs 9173 tc2 9184 tcsni 9185 dju1dif 9598 fpwwe2lem13 10064 wunfi 10143 uniwun 10162 un0mulcl 11932 nn0ssz 12004 xrinfmss 12704 hashbclem 13811 hashf1lem1 13814 hashf1lem2 13815 fsum2dlem 15125 fsumabs 15156 fsumrlim 15166 fsumo1 15167 fsumiun 15176 incexclem 15191 fprod2dlem 15334 lcmfunsnlem 15985 lcmfun 15989 coprmprod 16005 coprmproddvdslem 16006 ramcl2 16352 0ram 16356 strfv 16531 imasaddfnlem 16801 imasaddvallem 16802 acsfn1 16932 drsdirfi 17548 sylow2a 18744 gsumpt 19082 dprdfadd 19142 ablfac1eulem 19194 pgpfaclem1 19203 acsfn1p 19578 rsp1 19997 mplcoe1 20246 mplcoe5 20249 mdetunilem9 21229 opnnei 21728 iscnp4 21871 cnpnei 21872 hausnei2 21961 fiuncmp 22012 llycmpkgen2 22158 1stckgen 22162 ptbasfi 22189 xkoccn 22227 xkoptsub 22262 ptcmpfi 22421 cnextcn 22675 tsmsid 22748 ustuqtop3 22852 utopreg 22861 prdsdsf 22977 prdsmet 22980 prdsbl 23101 fsumcn 23478 itgfsum 24427 dvmptfsum 24572 elply2 24786 elplyd 24792 ply1term 24794 ply0 24798 plymullem 24806 jensenlem1 25564 jensenlem2 25565 frcond3 28048 h1de2bi 29331 spansni 29334 gsumle 30725 gsumvsca1 30854 gsumvsca2 30855 extdg1id 31053 ordtconnlem1 31167 cntnevol 31487 eulerpartgbij 31630 breprexpnat 31905 cvmlift2lem1 32549 cvmlift2lem12 32561 dfon2lem7 33034 bj-tagss 34295 lindsenlbs 34902 matunitlindflem1 34903 divrngidl 35321 isfldidl 35361 ispridlc 35363 pclfinclN 37101 osumcllem10N 37116 pexmidlem7N 37127 clsk1indlem4 40414 clsk1indlem1 40415 fourierdlem62 42473 |
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