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Mirrors > Home > MPE Home > Th. List > snnzg | Structured version Visualization version GIF version |
Description: The singleton of a set is not empty. (Contributed by NM, 14-Dec-2008.) |
Ref | Expression |
---|---|
snnzg | ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snidg 4559 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
2 | 1 | ne0d 4251 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2111 ≠ wne 2987 ∅c0 4243 {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-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-ne 2988 df-dif 3884 df-nul 4244 df-sn 4526 |
This theorem is referenced by: snn0d 4671 snnz 4672 0nelop 5351 frirr 5496 frsn 5603 omsucne 7578 1stconst 7778 2ndconst 7779 fczsupp0 7842 hashge3el3dif 13840 pwsbas 16752 pwsle 16757 trnei 22497 uffix 22526 neiflim 22579 hausflim 22586 flimcf 22587 flimclslem 22589 cnpflf2 22605 cnpflf 22606 fclsfnflim 22632 ustneism 22829 ustuqtop5 22851 neipcfilu 22902 dv11cn 24604 snsssng 30284 cosnop 30455 zarclssn 31226 noextendseq 33287 scutbdaylt 33389 elpaddat 37100 elpadd2at 37102 mnuprdlem1 40980 ovnovollem3 43297 |
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