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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 3807 | . . 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 |
| Syntax hints: → wi 4 ↔ wb 105 ∈ wcel 2202 ⊆ wss 3200 {csn 3669 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-in 3206 df-ss 3213 df-sn 3675 |
| This theorem is referenced by: pwntru 4289 ecinxp 6779 xpdom3m 7018 ac6sfi 7087 undifdc 7116 iunfidisj 7145 fidcenumlemr 7154 ssfii 7173 en2other2 7407 pw1m 7442 un0addcl 9435 un0mulcl 9436 fseq1p1m1 10329 fsumge1 12027 fprodsplit1f 12200 bitsinv1 12528 phicl2 12791 ennnfonelemhf1o 13039 imasaddfnlemg 13402 imasaddflemg 13404 0subm 13572 gsumvallem2 13581 trivsubgd 13792 trivsubgsnd 13793 trivnsgd 13809 kerf1ghm 13866 lsssn0 14390 lss0ss 14391 lsptpcl 14414 lspsnvsi 14438 lspun0 14445 mulgrhm2 14630 zndvds 14669 rest0 14909 iscnp4 14948 cnconst2 14963 cnpdis 14972 txdis 15007 txdis1cn 15008 fsumcncntop 15297 dvef 15457 plyf 15467 elplyr 15470 elplyd 15471 ply1term 15473 plyaddlem 15479 plymullem 15480 plycolemc 15488 plycn 15492 dvply2g 15496 perfectlem2 15730 upgr1elem1 15977 bj-omtrans 16577 pwtrufal 16624 gfsumcl 16714 |
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