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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 4153 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
2 | ne0i 3880 | . 2 ⊢ (𝐴 ∈ {𝐴} → {𝐴} ≠ ∅) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1977 ≠ wne 2780 ∅c0 3874 {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-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 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-ne 2782 df-v 3175 df-dif 3543 df-nul 3875 df-sn 4126 |
This theorem is referenced by: snnz 4252 0nelop 4886 frirr 5015 frsn 5112 1stconst 7152 2ndconst 7153 fczsupp0 7211 hashge3el3dif 13122 pwsbas 15970 pwsle 15975 trnei 21506 uffix 21535 neiflim 21588 hausflim 21595 flimcf 21596 flimclslem 21598 cnpflf2 21614 cnpflf 21615 fclsfnflim 21641 ustneism 21837 ustuqtop5 21859 neipcfilu 21910 dv11cn 23568 usgra1v 25919 elpaddat 34108 elpadd2at 34110 snn0d 38284 ovnovollem3 39548 |
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