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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 4615 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4292 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2113 ≠ wne 2930 ∅c0 4283 {csn 4578 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2713 df-cleq 2726 df-clel 2809 df-ne 2931 df-dif 3902 df-nul 4284 df-sn 4579 |
| This theorem is referenced by: snn0d 4730 snnz 4731 frirr 5598 frsn 5710 omsucne 7825 1stconst 8040 2ndconst 8041 fczsupp0 8133 hashge3el3dif 14408 pwsbas 17405 pwsle 17411 trnei 23834 uffix 23863 neiflim 23916 flimclslem 23926 fclsfnflim 23969 ustneism 24166 ustuqtop5 24187 dv11cn 25960 noextendseq 27633 scutbdaylt 27786 eqscut3 27792 lltropt 27844 snsssng 32538 cosnop 32723 elpadd2at 40005 onnog 43612 onnobdayg 43613 bdaybndbday 43615 |
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