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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 4605 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4283 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 ∅c0 4274 {csn 4568 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-dif 3893 df-nul 4275 df-sn 4569 |
| This theorem is referenced by: snn0d 4720 snnz 4721 frirr 5601 frsn 5713 omsucne 7830 1stconst 8044 2ndconst 8045 fczsupp0 8137 hashge3el3dif 14443 pwsbas 17444 pwsle 17450 trnei 23870 uffix 23899 neiflim 23952 flimclslem 23962 fclsfnflim 24005 ustneism 24202 ustuqtop5 24223 dv11cn 25981 noextendseq 27648 cutbdaylt 27807 eqcuts3 27813 lltr 27871 snsssng 32602 cosnop 32786 mh-inf3sn 36743 elpadd2at 40269 onnoxpg 43877 onnobdayg 43878 bdaybndbday 43880 |
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