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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 4621 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4288 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2145 ≠ wne 2956 ∅c0 4279 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-dif 3902 df-nul 4280 df-sn 4585 |
| This theorem is used by: snn0d 4736 snnz 4737 frirr 5627 frsn 5739 omsucne 7896 1stconst 8111 2ndconst 8112 fczsupp0 8210 hashge3el3dif 14632 pwsbas 17658 pwsle 17664 trnei 24211 uffix 24240 neiflim 24293 flimclslem 24303 fclsfnflim 24346 ustneism 24543 ustuqtop5 24564 dv11cn 26321 noextendseq 28024 cutbdaylt 28184 eqcuts3 28190 lltr 28248 snsssng 33110 cosnop 33288 mh-inf3sn 37330 elpadd2at 40863 onnoxpg 44429 onnobdayg 44430 bdaybndbday 44432 |
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