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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 3844 | . . 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 2209 ⊆ wss 3220 {csn 3705 |
| 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 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 df-ss 3233 df-sn 3711 |
| This theorem is referenced by: pwntru 4331 ecinxp 6874 xpdom3m 7122 ac6sfi 7192 undifdc 7221 iunfidisj 7250 fidcenumlemr 7262 ssfii 7298 en2other2 7538 pw1m 7573 un0addcl 9575 un0mulcl 9576 fseq1p1m1 10479 hashfibclem 11260 hashf1lem1 11263 hashf1lem2 11264 fsumge1 12206 fprodsplit1f 12379 bitsinv1 12707 phicl2 12970 ennnfonelemhf1o 13282 imasaddfnlemg 13612 imasaddflemg 13614 0subm 13768 gsumvallem2 13777 trivsubgd 13980 trivsubgsnd 13981 trivnsgd 13997 kerf1ghm 14054 gsumclfi 14136 gsummptfidmadd 14138 gsumsubmclfi 14140 lsssn0 14679 lss0ss 14680 lsptpcl 14703 lspsnvsi 14727 lspun0 14734 mulgrhm2 14917 zndvds 14956 rest0 15203 iscnp4 15242 cnconst2 15257 cnpdis 15266 txdis 15301 txdis1cn 15302 fsumcncntop 15591 dvef 15751 plyf 15761 elplyr 15764 elplyd 15765 ply1term 15767 plyaddlem 15773 plymullem 15774 plycolemc 15782 plycn 15786 dvply2g 15790 perfectlem2 16028 upgr1elem1 16275 bj-omtrans 16896 pwtrufal 16941 |
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