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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 4622 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4291 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2147 ≠ wne 2959 ∅c0 4281 {csn 4588 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-dif 4050 df-nul 4282 df-sn 4589 |
| This theorem is used by: snn0d 4738 snnz 4739 frirr 5634 frsn 5747 omsucne 7930 1stconst 8148 2ndconst 8149 fczsupp0 8248 hashge3el3dif 14673 pwsbas 17708 pwsle 17714 trnei 24266 uffix 24295 neiflim 24348 flimclslem 24358 fclsfnflim 24401 ustneism 24598 ustuqtop5 24619 dv11cn 26376 noextendseq 28081 cutbdaylt 28241 eqcuts3 28247 lltr 28305 snsssng 33209 cosnop 33385 mh-inf3sn 37545 elpadd2at 41129 onnoxpg 44691 onnobdayg 44692 bdaybndbday 44694 |
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