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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 4631 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4303 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2149 ≠ wne 2964 ∅c0 4294 {csn 4594 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-dif 3916 df-nul 4295 df-sn 4595 |
| This theorem is referenced by: snn0d 4746 snnz 4747 frirr 5638 frsn 5750 omsucne 7881 1stconst 8095 2ndconst 8096 fczsupp0 8189 hashge3el3dif 14524 pwsbas 17540 pwsle 17546 trnei 24018 uffix 24047 neiflim 24100 flimclslem 24110 fclsfnflim 24153 ustneism 24350 ustuqtop5 24371 dv11cn 26129 noextendseq 27797 cutbdaylt 27957 eqcuts3 27963 lltr 28021 snsssng 32801 cosnop 32981 mh-inf3sn 36942 elpadd2at 40470 onnoxpg 44047 onnobdayg 44048 bdaybndbday 44050 |
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