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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 4736 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2145 ≠ wne 2960 Vcvv 3457 ∅c0 4288 {csn 4585 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-dif 3910 df-nul 4289 df-sn 4586 |
| This theorem is referenced by: snsssn 4802 0nep0 5319 notzfaus 5325 nnullss 5434 snopeqop 5480 opthwiener 5488 fparlem3 8097 fparlem4 8098 1n0OLD 8461 fodomr 9104 mapdom3 9125 fodomfir 9275 ssfii 9367 marypha1lem 9381 djuexb 9883 fseqdom 9998 dfac5lem3 10097 isfin1-3 10358 axcc2lem 10408 axdc4lem 10427 fpwwe2lem12 10615 hash1n0 14448 s1nz 14635 isumltss 15892 pmtrprfvalrn 19549 gsumxp 20037 lsssn0 21038 pzriprnglem4 21594 frlmip 21888 t1connperf 23554 dissnlocfin 23647 isufil2 24026 cnextf 24184 ustuqtop1 24359 rrxip 25510 dveq0 26120 noxp1o 27785 bdayfo 27799 noetasuplem2 27856 noetasuplem4 27858 noetainflem2 27860 noetainflem4 27862 cutsun12 27941 cuteq0 27966 cuteq1 27968 cofcut1 28071 addcuts2 28130 leadds1 28140 addsuniflem 28152 addsasslem1 28154 addsasslem2 28155 negcut2 28191 mulcut2 28284 wwlksnext 30151 clwwlknon1sn 30360 esumnul 34355 bnj970 35252 filnetlem4 36754 bj-0nelsngl 37468 bj-2upln1upl 37521 dibn0 41789 diophrw 43352 dfac11 43651 fucofvalne 49954 |
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