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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 3656 | . . 3 ⊢ (𝐴 ∈ 𝐵 → (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵)) | |
3 | 1, 2 | syl 14 | . 2 ⊢ (𝜑 → (𝐴 ∈ 𝐵 ↔ {𝐴} ⊆ 𝐵)) |
4 | 1, 3 | mpbid 146 | 1 ⊢ (𝜑 → {𝐴} ⊆ 𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 ∈ wcel 1480 ⊆ wss 3071 {csn 3527 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-in 3077 df-ss 3084 df-sn 3533 |
This theorem is referenced by: pwntru 4122 ecinxp 6504 xpdom3m 6728 ac6sfi 6792 undifdc 6812 iunfidisj 6834 fidcenumlemr 6843 ssfii 6862 en2other2 7052 un0addcl 9010 un0mulcl 9011 fseq1p1m1 9874 fsumge1 11230 phicl2 11890 ennnfonelemhf1o 11926 rest0 12348 iscnp4 12387 cnconst2 12402 cnpdis 12411 txdis 12446 txdis1cn 12447 fsumcncntop 12725 dvef 12856 bj-omtrans 13154 pwtrufal 13192 |
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