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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 4626 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4295 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2143 ≠ wne 2958 ∅c0 4286 {csn 4589 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-dif 3908 df-nul 4287 df-sn 4590 |
| This theorem is referenced by: snn0d 4741 snnz 4742 frirr 5637 frsn 5749 omsucne 7877 1stconst 8091 2ndconst 8092 fczsupp0 8185 hashge3el3dif 14520 pwsbas 17535 pwsle 17541 trnei 24049 uffix 24078 neiflim 24131 flimclslem 24141 fclsfnflim 24184 ustneism 24381 ustuqtop5 24402 dv11cn 26160 noextendseq 27831 cutbdaylt 27991 eqcuts3 27997 lltr 28055 snsssng 32860 cosnop 33040 mh-inf3sn 37073 elpadd2at 40600 onnoxpg 44175 onnobdayg 44176 bdaybndbday 44178 |
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