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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 3805 | . . 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 2200 ⊆ wss 3198 {csn 3667 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2802 df-in 3204 df-ss 3211 df-sn 3673 |
| This theorem is referenced by: pwntru 4287 ecinxp 6774 xpdom3m 7013 ac6sfi 7080 undifdc 7109 iunfidisj 7136 fidcenumlemr 7145 ssfii 7164 en2other2 7397 pw1m 7432 un0addcl 9425 un0mulcl 9426 fseq1p1m1 10319 fsumge1 12012 fprodsplit1f 12185 bitsinv1 12513 phicl2 12776 ennnfonelemhf1o 13024 imasaddfnlemg 13387 imasaddflemg 13389 0subm 13557 gsumvallem2 13566 trivsubgd 13777 trivsubgsnd 13778 trivnsgd 13794 kerf1ghm 13851 lsssn0 14374 lss0ss 14375 lsptpcl 14398 lspsnvsi 14422 lspun0 14429 mulgrhm2 14614 zndvds 14653 rest0 14893 iscnp4 14932 cnconst2 14947 cnpdis 14956 txdis 14991 txdis1cn 14992 fsumcncntop 15281 dvef 15441 plyf 15451 elplyr 15454 elplyd 15455 ply1term 15457 plyaddlem 15463 plymullem 15464 plycolemc 15472 plycn 15476 dvply2g 15480 perfectlem2 15714 upgr1elem1 15961 bj-omtrans 16487 pwtrufal 16534 |
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