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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 4701 | . 2 ⊢ (𝐴 ∈ 𝐵 → {𝐴} ⊆ 𝐵) | |
2 | snex 5297 | . . 3 ⊢ {𝐴} ∈ V | |
3 | 2 | elpw 4501 | . 2 ⊢ ({𝐴} ∈ 𝒫 𝐵 ↔ {𝐴} ⊆ 𝐵) |
4 | 1, 3 | sylibr 237 | 1 ⊢ (𝐴 ∈ 𝐵 → {𝐴} ∈ 𝒫 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2111 ⊆ wss 3881 𝒫 cpw 4497 {csn 4525 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-pw 4499 df-sn 4526 df-pr 4528 |
This theorem is referenced by: unipw 5308 canth2 8654 unifpw 8811 marypha1lem 8881 infpwfidom 9439 ackbij1lem4 9634 acsfn 16922 sylow2a 18736 dissnref 22133 dissnlocfin 22134 locfindis 22135 txdis 22237 txdis1cn 22240 symgtgp 22711 dispcmp 31212 esumcst 31432 cntnevol 31597 coinflippvt 31852 onsucsuccmpi 33904 topdifinffinlem 34764 pclfinN 37196 lpirlnr 40061 unipwrVD 41538 unipwr 41539 salexct 42974 salexct3 42982 salgencntex 42983 salgensscntex 42984 sge0tsms 43019 sge0cl 43020 sge0sup 43030 lincvalsng 44825 snlindsntor 44880 |
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