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| Mirrors > Home > MPE Home > Th. List > snnz | Structured version Visualization version GIF version | ||
| Description: The singleton of a set is not empty. (Contributed by NM, 10-Apr-1994.) |
| Ref | Expression |
|---|---|
| snnz.1 | ⊢ 𝐴 ∈ V |
| Ref | Expression |
|---|---|
| snnz | ⊢ {𝐴} ≠ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snnz.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | snnzg 4732 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2141 ≠ wne 2956 Vcvv 3453 ∅c0 4285 {csn 4581 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-dif 3907 df-nul 4286 df-sn 4582 |
| This theorem is referenced by: snsssn 4798 0nep0 5313 notzfaus 5319 nnullss 5428 snopeqop 5474 opthwiener 5482 fparlem3 8088 fparlem4 8089 1n0OLD 8452 fodomr 9096 mapdom3 9117 fodomfir 9268 ssfii 9362 marypha1lem 9376 djuexb 9864 fseqdom 9979 dfac5lem3 10078 isfin1-3 10340 axcc2lem 10390 axdc4lem 10409 fpwwe2lem12 10597 hash1n0 14431 s1nz 14618 isumltss 15861 pmtrprfvalrn 19511 gsumxp 19999 lsssn0 20995 pzriprnglem4 21516 frlmip 21810 t1connperf 23476 dissnlocfin 23569 isufil2 23948 cnextf 24106 ustuqtop1 24281 rrxip 25432 dveq0 26042 noxp1o 27704 bdayfo 27718 noetasuplem2 27775 noetasuplem4 27777 noetainflem2 27779 noetainflem4 27781 cutsun12 27860 cuteq0 27885 cuteq1 27887 cofcut1 27990 addcuts2 28049 leadds1 28059 addsuniflem 28071 addsasslem1 28073 addsasslem2 28074 negcut2 28110 mulcut2 28203 wwlksnext 30039 clwwlknon1sn 30248 esumnul 34306 bnj970 35206 filnetlem4 36705 bj-0nelsngl 37420 bj-2upln1upl 37473 dibn0 41741 diophrw 43304 dfac11 43603 fucofvalne 49910 |
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