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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 4738 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 ≠ wne 2957 Vcvv 3453 ∅c0 4282 {csn 4587 |
| 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 2147 ax-9 2155 ax-ext 2734 |
| 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 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-dif 3905 df-nul 4283 df-sn 4588 |
| This theorem is used by: snsssn 4804 0nep0 5326 notsep 5332 nnullss 5441 snopeqop 5487 opthwiener 5495 fparlem3 8115 fparlem4 8116 1n0OLD 8479 fodomr 9130 mapdom3 9151 fodomfir 9301 ssfii 9393 marypha1lem 9407 djuexb 9918 fseqdom 10033 dfac5lem3 10132 isfin1-3 10392 axcc2lem 10442 axdc4lem 10461 fpwwe2lem12 10655 hash1n0 14490 s1nz 14678 isumltss 15941 degenmgmnfn 19055 pmtrprfvalrn 19621 gsumxp 20109 lsssn0 21138 pzriprnglem4 21703 frlmip 21997 t1connperf 23667 dissnlocfin 23761 isufil2 24140 cnextf 24298 ustuqtop1 24473 rrxip 25624 dveq0 26234 noxp1o 27907 bdayfo 27921 noetasuplem2 27978 noetasuplem4 27980 noetainflem2 27982 noetainflem4 27984 cutsun12 28063 cuteq0 28088 cuteq1 28090 cofcut1 28193 addcuts2 28252 leadds1 28262 addsuniflem 28274 addsasslem1 28276 addsasslem2 28277 negcut2 28313 mulcut2 28406 wwlksnext 30369 clwwlknon1sn 30578 esumnul 34566 bnj970 35464 filnetlem4 37008 bj-0nelsngl 37723 bj-2upln1upl 37776 dibn0 42034 diophrw 43612 dfac11 43911 fucofvalne 50259 |
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