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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 4294 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2142 ≠ wne 2957 ∅c0 4285 {csn 4582 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-ext 2734 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1563 df-fal 1573 df-ex 1800 df-sb 2091 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-dif 3907 df-nul 4286 df-sn 4583 |
| This theorem is referenced by: snn0d 4734 snnz 4735 frirr 5623 frsn 5735 omsucne 7865 1stconst 8079 2ndconst 8080 fczsupp0 8173 hashge3el3dif 14500 pwsbas 17516 pwsle 17522 trnei 23952 uffix 23981 neiflim 24034 flimclslem 24044 fclsfnflim 24087 ustneism 24284 ustuqtop5 24305 dv11cn 26063 noextendseq 27731 cutbdaylt 27891 eqcuts3 27897 lltr 27955 snsssng 32713 cosnop 32897 mh-inf3sn 36902 elpadd2at 40430 onnoxpg 44005 onnobdayg 44006 bdaybndbday 44008 |
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