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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 4619 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
| 2 | 1 | ne0d 4296 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 ∅c0 4287 {csn 4582 |
| 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 3906 df-nul 4288 df-sn 4583 |
| This theorem is referenced by: snn0d 4734 snnz 4735 frirr 5608 frsn 5720 omsucne 7837 1stconst 8052 2ndconst 8053 fczsupp0 8145 hashge3el3dif 14422 pwsbas 17419 pwsle 17425 trnei 23848 uffix 23877 neiflim 23930 flimclslem 23940 fclsfnflim 23983 ustneism 24180 ustuqtop5 24201 dv11cn 25974 noextendseq 27647 cutbdaylt 27806 eqcuts3 27812 lltr 27870 snsssng 32601 cosnop 32785 elpadd2at 40182 onnoxpg 43785 onnobdayg 43786 bdaybndbday 43788 |
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