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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 4713 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2119 ≠ wne 2935 Vcvv 3432 ∅c0 4268 {csn 4562 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2712 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2719 df-cleq 2732 df-clel 2815 df-ne 2936 df-dif 3893 df-nul 4269 df-sn 4563 |
| This theorem is referenced by: snsssn 4779 0nep0 5293 notzfaus 5299 nnullss 5408 snopeqop 5454 opthwiener 5462 fparlem3 8060 fparlem4 8061 1n0 8420 fodomr 9063 mapdom3 9084 fodomfir 9235 ssfii 9329 marypha1lem 9343 djuexb 9831 fseqdom 9946 dfac5lem3 10045 isfin1-3 10306 axcc2lem 10356 axdc4lem 10375 fpwwe2lem12 10563 hash1n0 14381 s1nz 14568 isumltss 15811 pmtrprfvalrn 19461 gsumxp 19949 lsssn0 20945 pzriprnglem4 21466 frlmip 21760 t1connperf 23426 dissnlocfin 23519 isufil2 23898 cnextf 24056 ustuqtop1 24231 rrxip 25382 dveq0 25992 noxp1o 27652 bdayfo 27666 noetasuplem2 27723 noetasuplem4 27725 noetainflem2 27727 noetainflem4 27729 cutsun12 27807 cuteq0 27832 cuteq1 27834 cofcut1 27937 addcuts2 27996 leadds1 28006 addsuniflem 28018 addsasslem1 28020 addsasslem2 28021 negcut2 28057 mulcut2 28150 wwlksnext 29986 clwwlknon1sn 30195 esumnul 34239 bnj970 35136 filnetlem4 36616 bj-0nelsngl 37331 bj-2upln1upl 37384 dibn0 41652 diophrw 43215 dfac11 43514 fucofvalne 49822 |
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