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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 3664 | . . 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 1481 ⊆ wss 3076 {csn 3532 |
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 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-in 3082 df-ss 3089 df-sn 3538 |
This theorem is referenced by: pwntru 4130 ecinxp 6512 xpdom3m 6736 ac6sfi 6800 undifdc 6820 iunfidisj 6842 fidcenumlemr 6851 ssfii 6870 en2other2 7069 un0addcl 9034 un0mulcl 9035 fseq1p1m1 9905 fsumge1 11262 phicl2 11926 ennnfonelemhf1o 11962 rest0 12387 iscnp4 12426 cnconst2 12441 cnpdis 12450 txdis 12485 txdis1cn 12486 fsumcncntop 12764 dvef 12896 bj-omtrans 13325 pwtrufal 13365 |
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