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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 4718 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 ≠ wne 2932 Vcvv 3429 ∅c0 4273 {csn 4567 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-dif 3892 df-nul 4274 df-sn 4568 |
| This theorem is referenced by: snsssn 4784 0nep0 5299 notzfaus 5305 nnullss 5414 snopeqop 5460 opthwiener 5468 fparlem3 8064 fparlem4 8065 1n0 8423 fodomr 9066 mapdom3 9087 fodomfir 9238 ssfii 9332 marypha1lem 9346 djuexb 9833 fseqdom 9948 dfac5lem3 10047 isfin1-3 10308 axcc2lem 10358 axdc4lem 10377 fpwwe2lem12 10565 hash1n0 14383 s1nz 14570 isumltss 15813 pmtrprfvalrn 19463 gsumxp 19951 lsssn0 20943 pzriprnglem4 21464 frlmip 21758 t1connperf 23401 dissnlocfin 23494 isufil2 23873 cnextf 24031 ustuqtop1 24206 rrxip 25357 dveq0 25967 noxp1o 27627 bdayfo 27641 noetasuplem2 27698 noetasuplem4 27700 noetainflem2 27702 noetainflem4 27704 cutsun12 27782 cuteq0 27807 cuteq1 27809 cofcut1 27912 addcuts2 27971 leadds1 27981 addsuniflem 27993 addsasslem1 27995 addsasslem2 27996 negcut2 28032 mulcut2 28125 wwlksnext 29961 clwwlknon1sn 30170 esumnul 34192 bnj970 35089 filnetlem4 36563 bj-0nelsngl 37278 bj-2upln1upl 37331 dibn0 41599 diophrw 43191 dfac11 43490 fucofvalne 49800 |
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