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Mirrors > Home > MPE Home > Th. List > snelpwi | Structured version Visualization version GIF version |
Description: A singleton of a set belongs to the power class of a class containing the set. (Contributed by Alan Sare, 25-Aug-2011.) |
Ref | Expression |
---|---|
snelpwi | ⊢ (𝐴 ∈ 𝐵 → {𝐴} ∈ 𝒫 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snssi 4280 | . 2 ⊢ (𝐴 ∈ 𝐵 → {𝐴} ⊆ 𝐵) | |
2 | snex 4835 | . . 3 ⊢ {𝐴} ∈ V | |
3 | 2 | elpw 4114 | . 2 ⊢ ({𝐴} ∈ 𝒫 𝐵 ↔ {𝐴} ⊆ 𝐵) |
4 | 1, 3 | sylibr 223 | 1 ⊢ (𝐴 ∈ 𝐵 → {𝐴} ∈ 𝒫 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1977 ⊆ wss 3540 𝒫 cpw 4108 {csn 4125 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-pw 4110 df-sn 4126 df-pr 4128 |
This theorem is referenced by: unipw 4845 canth2 7998 unifpw 8152 marypha1lem 8222 infpwfidom 8734 ackbij1lem4 8928 acsfn 16143 sylow2a 17857 dissnref 21141 dissnlocfin 21142 locfindis 21143 txdis 21245 txdis1cn 21248 symgtgp 21715 dispcmp 29254 esumcst 29452 cntnevol 29618 coinflippvt 29873 onsucsuccmpi 31612 topdifinffinlem 32371 pclfinN 34204 lpirlnr 36706 unipwrVD 38089 unipwr 38090 salexct 39228 salexct3 39236 salgencntex 39237 salgensscntex 39238 sge0tsms 39273 sge0cl 39274 sge0sup 39284 lincvalsng 41999 snlindsntor 42054 |
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