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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 6778 xpdom3m 7017 ac6sfi 7086 undifdc 7115 iunfidisj 7144 fidcenumlemr 7153 ssfii 7172 en2other2 7406 pw1m 7441 un0addcl 9434 un0mulcl 9435 fseq1p1m1 10328 fsumge1 12021 fprodsplit1f 12194 bitsinv1 12522 phicl2 12785 ennnfonelemhf1o 13033 imasaddfnlemg 13396 imasaddflemg 13398 0subm 13566 gsumvallem2 13575 trivsubgd 13786 trivsubgsnd 13787 trivnsgd 13803 kerf1ghm 13860 lsssn0 14383 lss0ss 14384 lsptpcl 14407 lspsnvsi 14431 lspun0 14438 mulgrhm2 14623 zndvds 14662 rest0 14902 iscnp4 14941 cnconst2 14956 cnpdis 14965 txdis 15000 txdis1cn 15001 fsumcncntop 15290 dvef 15450 plyf 15460 elplyr 15463 elplyd 15464 ply1term 15466 plyaddlem 15472 plymullem 15473 plycolemc 15481 plycn 15485 dvply2g 15489 perfectlem2 15723 upgr1elem1 15970 bj-omtrans 16551 pwtrufal 16598 |
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