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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 4592 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4270 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2119 ≠ wne 2934 ∅c0 4261 {csn 4555 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-dif 3886 df-nul 4262 df-sn 4556 |
| This theorem is referenced by: snn0d 4707 snnz 4708 frirr 5594 frsn 5706 omsucne 7825 1stconst 8039 2ndconst 8040 fczsupp0 8133 hashge3el3dif 14440 pwsbas 17441 pwsle 17447 trnei 23875 uffix 23904 neiflim 23957 flimclslem 23967 fclsfnflim 24010 ustneism 24207 ustuqtop5 24228 dv11cn 25986 noextendseq 27649 cutbdaylt 27808 eqcuts3 27814 lltr 27872 snsssng 32602 cosnop 32787 mh-inf3sn 36770 elpadd2at 40298 onnoxpg 43873 onnobdayg 43874 bdaybndbday 43876 |
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