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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 3812 | . . 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 3201 {csn 3673 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-in 3207 df-ss 3214 df-sn 3679 |
| This theorem is referenced by: pwntru 4295 ecinxp 6822 xpdom3m 7061 ac6sfi 7130 undifdc 7159 iunfidisj 7188 fidcenumlemr 7197 ssfii 7216 en2other2 7450 pw1m 7485 un0addcl 9477 un0mulcl 9478 fseq1p1m1 10374 fsumge1 12085 fprodsplit1f 12258 bitsinv1 12586 phicl2 12849 ennnfonelemhf1o 13097 imasaddfnlemg 13460 imasaddflemg 13462 0subm 13630 gsumvallem2 13639 trivsubgd 13850 trivsubgsnd 13851 trivnsgd 13867 kerf1ghm 13924 lsssn0 14449 lss0ss 14450 lsptpcl 14473 lspsnvsi 14497 lspun0 14504 mulgrhm2 14689 zndvds 14728 rest0 14973 iscnp4 15012 cnconst2 15027 cnpdis 15036 txdis 15071 txdis1cn 15072 fsumcncntop 15361 dvef 15521 plyf 15531 elplyr 15534 elplyd 15535 ply1term 15537 plyaddlem 15543 plymullem 15544 plycolemc 15552 plycn 15556 dvply2g 15560 perfectlem2 15797 upgr1elem1 16044 bj-omtrans 16655 pwtrufal 16702 gfsumcl 16799 |
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