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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 3828 | . . 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 2203 ⊆ wss 3211 {csn 3689 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-in 3217 df-ss 3224 df-sn 3695 |
| This theorem is referenced by: pwntru 4312 ecinxp 6844 xpdom3m 7085 ac6sfi 7155 undifdc 7184 iunfidisj 7213 fidcenumlemr 7225 ssfii 7261 en2other2 7499 pw1m 7534 un0addcl 9529 un0mulcl 9530 fseq1p1m1 10428 hashfibclem 11206 fsumge1 12147 fprodsplit1f 12320 bitsinv1 12648 phicl2 12911 ennnfonelemhf1o 13164 imasaddfnlemg 13527 imasaddflemg 13529 0subm 13697 gsumvallem2 13706 trivsubgd 13917 trivsubgsnd 13918 trivnsgd 13934 kerf1ghm 13991 lsssn0 14518 lss0ss 14519 lsptpcl 14542 lspsnvsi 14566 lspun0 14573 mulgrhm2 14758 zndvds 14797 rest0 15044 iscnp4 15083 cnconst2 15098 cnpdis 15107 txdis 15142 txdis1cn 15143 fsumcncntop 15432 dvef 15592 plyf 15602 elplyr 15605 elplyd 15606 ply1term 15608 plyaddlem 15614 plymullem 15615 plycolemc 15623 plycn 15627 dvply2g 15631 perfectlem2 15868 upgr1elem1 16115 bj-omtrans 16726 pwtrufal 16771 gfsumcl 16870 |
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