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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 4621 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4288 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2145 ≠ wne 2955 ∅c0 4279 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-dif 3902 df-nul 4280 df-sn 4585 |
| This theorem is used by: snn0d 4736 snnz 4737 frirr 5631 frsn 5743 omsucne 7882 1stconst 8098 2ndconst 8099 fczsupp0 8192 hashge3el3dif 14555 pwsbas 17575 pwsle 17581 trnei 24121 uffix 24150 neiflim 24203 flimclslem 24213 fclsfnflim 24256 ustneism 24453 ustuqtop5 24474 dv11cn 26231 noextendseq 27906 cutbdaylt 28066 eqcuts3 28072 lltr 28130 snsssng 32992 cosnop 33170 mh-inf3sn 37164 elpadd2at 40682 onnoxpg 44272 onnobdayg 44273 bdaybndbday 44275 |
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