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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 4728 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 ≠ wne 2930 Vcvv 3438 ∅c0 4284 {csn 4577 |
| 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 2705 |
| 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 2712 df-cleq 2725 df-clel 2808 df-ne 2931 df-dif 3902 df-nul 4285 df-sn 4578 |
| This theorem is referenced by: snsssn 4794 0nep0 5300 notzfaus 5305 nnullss 5407 snopeqop 5451 opthwiener 5459 fparlem3 8053 fparlem4 8054 1n0 8412 fodomr 9051 mapdom3 9072 fodomfir 9222 ssfii 9313 marypha1lem 9327 djuexb 9812 fseqdom 9927 dfac5lem3 10026 isfin1-3 10287 axcc2lem 10337 axdc4lem 10356 fpwwe2lem12 10543 hash1n0 14338 s1nz 14525 isumltss 15765 pmtrprfvalrn 19410 gsumxp 19898 lsssn0 20891 pzriprnglem4 21431 frlmip 21725 t1connperf 23361 dissnlocfin 23454 isufil2 23833 cnextf 23991 ustuqtop1 24166 rrxip 25327 dveq0 25942 noxp1o 27612 bdayfo 27626 noetasuplem2 27683 noetasuplem4 27685 noetainflem2 27687 noetainflem4 27689 scutun12 27761 cuteq0 27786 cuteq1 27788 cofcut1 27874 addscut2 27932 sleadd1 27942 addsuniflem 27954 addsasslem1 27956 addsasslem2 27957 negscut2 27992 mulscut2 28082 wwlksnext 29882 clwwlknon1sn 30091 esumnul 34072 bnj970 34970 filnetlem4 36436 bj-0nelsngl 37026 bj-2upln1upl 37079 dibn0 41262 diophrw 42866 dfac11 43169 fucofvalne 49440 |
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