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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 4628 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4295 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ≠ wne 2960 ∅c0 4286 {csn 4591 |
| 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 2148 ax-9 2156 ax-ext 2737 |
| 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 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-dif 3909 df-nul 4287 df-sn 4592 |
| This theorem is used by: snn0d 4743 snnz 4744 frirr 5639 frsn 5751 omsucne 7887 1stconst 8101 2ndconst 8102 fczsupp0 8195 hashge3el3dif 14544 pwsbas 17564 pwsle 17570 trnei 24102 uffix 24131 neiflim 24184 flimclslem 24194 fclsfnflim 24237 ustneism 24434 ustuqtop5 24455 dv11cn 26213 noextendseq 27884 cutbdaylt 28044 eqcuts3 28050 lltr 28108 snsssng 32933 cosnop 33113 mh-inf3sn 37112 elpadd2at 40640 onnoxpg 44215 onnobdayg 44216 bdaybndbday 44218 |
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