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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 4336 ecinxp 6884 xpdom3m 7132 ac6sfi 7202 undifdc 7231 iunfidisj 7260 fidcenumlemr 7272 ssfii 7308 en2other2 7548 pw1m 7583 un0addcl 9600 un0mulcl 9601 fseq1p1m1 10511 hashfibclem 11296 hashf1lem1 11299 hashf1lem2 11300 fsumge1 12244 fprodsplit1f 12417 bitsinv1 12745 phicl2 13012 ennnfonelemhf1o 13353 imasaddfnlemg 13684 imasaddflemg 13686 0subm 13840 gsumvallem2 13849 trivsubgd 14052 trivsubgsnd 14053 trivnsgd 14069 kerf1ghm 14126 gsumclfi 14208 gsummptfidmadd 14210 gsumsubmclfi 14212 lsssn0 14756 lss0ss 14757 lsptpcl 14780 lspsnvsi 14804 lspun0 14811 mulgrhm2 14994 zndvds 15033 rest0 15329 iscnp4 15368 cnconst2 15383 cnpdis 15392 txdis 15427 txdis1cn 15428 fsumcncntop 15717 dvef 15877 plyf 15887 elplyr 15890 elplyd 15891 ply1term 15893 plyaddlem 15899 plymullem 15900 plycolemc 15908 plycn 15912 dvply2g 15916 ppiprm 16170 perfectlem2 16198 upgr1elem1 16459 bj-omtrans 17080 pwtrufal 17125 |
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