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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 4731 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 ≠ wne 2932 Vcvv 3440 ∅c0 4285 {csn 4580 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-dif 3904 df-nul 4286 df-sn 4581 |
| This theorem is referenced by: snsssn 4797 0nep0 5303 notzfaus 5308 nnullss 5410 snopeqop 5454 opthwiener 5462 fparlem3 8056 fparlem4 8057 1n0 8415 fodomr 9056 mapdom3 9077 fodomfir 9228 ssfii 9322 marypha1lem 9336 djuexb 9821 fseqdom 9936 dfac5lem3 10035 isfin1-3 10296 axcc2lem 10346 axdc4lem 10365 fpwwe2lem12 10553 hash1n0 14344 s1nz 14531 isumltss 15771 pmtrprfvalrn 19417 gsumxp 19905 lsssn0 20899 pzriprnglem4 21439 frlmip 21733 t1connperf 23380 dissnlocfin 23473 isufil2 23852 cnextf 24010 ustuqtop1 24185 rrxip 25346 dveq0 25961 noxp1o 27631 bdayfo 27645 noetasuplem2 27702 noetasuplem4 27704 noetainflem2 27706 noetainflem4 27708 cutsun12 27786 cuteq0 27811 cuteq1 27813 cofcut1 27916 addcuts2 27975 leadds1 27985 addsuniflem 27997 addsasslem1 27999 addsasslem2 28000 negcut2 28036 mulcut2 28129 wwlksnext 29966 clwwlknon1sn 30175 esumnul 34205 bnj970 35103 filnetlem4 36575 bj-0nelsngl 37172 bj-2upln1upl 37225 dibn0 41409 diophrw 42997 dfac11 43300 fucofvalne 49566 |
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