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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 4619 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4296 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 ∅c0 4287 {csn 4582 |
| 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 2709 |
| 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 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-dif 3906 df-nul 4288 df-sn 4583 |
| This theorem is referenced by: snn0d 4734 snnz 4735 frirr 5610 frsn 5722 omsucne 7839 1stconst 8054 2ndconst 8055 fczsupp0 8147 hashge3el3dif 14424 pwsbas 17421 pwsle 17427 trnei 23853 uffix 23882 neiflim 23935 flimclslem 23945 fclsfnflim 23988 ustneism 24185 ustuqtop5 24206 dv11cn 25979 noextendseq 27652 cutbdaylt 27811 eqcuts3 27817 lltr 27875 snsssng 32607 cosnop 32791 elpadd2at 40211 onnoxpg 43814 onnobdayg 43815 bdaybndbday 43817 |
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