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| Mirrors > Home > ILE Home > Th. List > snssd | GIF version | ||
| Description: The singleton of an element of a class is a subset of the class (deduction form). (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) |
| Ref | Expression |
|---|---|
| snssd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) |
| Ref | Expression |
|---|---|
| snssd | ⊢ (𝜑 → {𝐴} ⊆ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snssd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
| 2 | snssg 3849 | . . 3 ⊢ (𝐴 ∈ 𝐵 → (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵)) | |
| 3 | 1, 2 | syl 14 | . 2 ⊢ (𝜑 → (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵)) |
| 4 | 1, 3 | mpbid 147 | 1 ⊢ (𝜑 → {𝐴} ⊆ 𝐵) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 ∈ wcel 2209 ⊆ wss 3220 {csn 3709 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 df-ss 3233 df-sn 3715 |
| This theorem is used by: pwntru 4338 ecinxp 6888 xpdom3m 7136 ac6sfi 7206 undifdc 7235 iunfidisj 7264 fidcenumlemr 7277 ssfii 7313 en2other2 7554 pw1m 7589 un0addcl 9607 un0mulcl 9608 fseq1p1m1 10518 hashfibclem 11304 hashf1lem1 11307 hashf1lem2 11308 fsumge1 12253 fprodsplit1f 12426 bitsinv1 12754 phicl2 13021 ennnfonelemhf1o 13362 imasaddfnlemg 13694 imasaddflemg 13696 0subm 13850 gsumvallem2 13859 trivsubgd 14062 trivsubgsnd 14063 trivnsgd 14079 kerf1ghm 14136 gsumclfi 14249 gsummptfidmadd 14251 gsumsubmclfi 14253 gsumresfi 14263 gsum2dfilem2 14272 lsssn0 14816 lss0ss 14817 lsptpcl 14840 lspsnvsi 14864 lspun0 14871 mulgrhm2 15054 zndvds 15093 psrlidmfi 15199 psrridmfi 15200 rest0 15405 iscnp4 15444 cnconst2 15459 cnpdis 15468 txdis 15503 txdis1cn 15504 fsumcncntop 15793 dvef 15953 plyf 15963 elplyr 15966 elplyd 15967 ply1term 15969 plyaddlem 15975 plymullem 15976 plycolemc 15984 plycn 15988 dvply2g 15992 ppiprm 16259 chtprm 16261 perfectlem2 16300 upgr1elem1 16566 bj-omtrans 17187 pwtrufal 17232 |
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