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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 3802 | . . 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 3197 {csn 3666 |
| 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 2801 df-in 3203 df-ss 3210 df-sn 3672 |
| This theorem is referenced by: pwntru 4283 ecinxp 6765 xpdom3m 7001 ac6sfi 7068 undifdc 7097 iunfidisj 7124 fidcenumlemr 7133 ssfii 7152 en2other2 7385 pw1m 7420 un0addcl 9413 un0mulcl 9414 fseq1p1m1 10302 fsumge1 11987 fprodsplit1f 12160 bitsinv1 12488 phicl2 12751 ennnfonelemhf1o 12999 imasaddfnlemg 13362 imasaddflemg 13364 0subm 13532 gsumvallem2 13541 trivsubgd 13752 trivsubgsnd 13753 trivnsgd 13769 kerf1ghm 13826 lsssn0 14349 lss0ss 14350 lsptpcl 14373 lspsnvsi 14397 lspun0 14404 mulgrhm2 14589 zndvds 14628 rest0 14868 iscnp4 14907 cnconst2 14922 cnpdis 14931 txdis 14966 txdis1cn 14967 fsumcncntop 15256 dvef 15416 plyf 15426 elplyr 15429 elplyd 15430 ply1term 15432 plyaddlem 15438 plymullem 15439 plycolemc 15447 plycn 15451 dvply2g 15455 perfectlem2 15689 upgr1elem1 15935 bj-omtrans 16374 pwtrufal 16422 |
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