| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 4620 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4290 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ≠ wne 2958 ∅c0 4280 {csn 4587 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-dif 4049 df-nul 4281 df-sn 4588 |
| This theorem is used by: snn0d 4735 snnz 4736 frirr 5630 frsn 5743 omsucne 7903 1stconst 8121 2ndconst 8122 fczsupp0 8221 hashge3el3dif 14642 pwsbas 17670 pwsle 17676 trnei 24223 uffix 24252 neiflim 24305 flimclslem 24315 fclsfnflim 24358 ustneism 24555 ustuqtop5 24576 dv11cn 26333 noextendseq 28036 cutbdaylt 28196 eqcuts3 28202 lltr 28260 snsssng 33164 cosnop 33342 mh-inf3sn 37457 elpadd2at 41003 onnoxpg 44570 onnobdayg 44571 bdaybndbday 44573 |
| Copyright terms: Public domain | W3C validator |