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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 4604 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4282 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2932 ∅c0 4273 {csn 4567 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-dif 3892 df-nul 4274 df-sn 4568 |
| This theorem is referenced by: snn0d 4719 snnz 4720 frirr 5607 frsn 5719 omsucne 7836 1stconst 8050 2ndconst 8051 fczsupp0 8143 hashge3el3dif 14449 pwsbas 17450 pwsle 17456 trnei 23857 uffix 23886 neiflim 23939 flimclslem 23949 fclsfnflim 23992 ustneism 24189 ustuqtop5 24210 dv11cn 25968 noextendseq 27631 cutbdaylt 27790 eqcuts3 27796 lltr 27854 snsssng 32584 cosnop 32768 mh-inf3sn 36724 elpadd2at 40252 onnoxpg 43856 onnobdayg 43857 bdaybndbday 43859 |
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