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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 4719 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 ≠ wne 2933 Vcvv 3430 ∅c0 4274 {csn 4568 |
| 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 2709 |
| 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 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-dif 3893 df-nul 4275 df-sn 4569 |
| This theorem is referenced by: snsssn 4785 0nep0 5295 notzfaus 5300 nnullss 5409 snopeqop 5454 opthwiener 5462 fparlem3 8057 fparlem4 8058 1n0 8416 fodomr 9059 mapdom3 9080 fodomfir 9231 ssfii 9325 marypha1lem 9339 djuexb 9824 fseqdom 9939 dfac5lem3 10038 isfin1-3 10299 axcc2lem 10349 axdc4lem 10368 fpwwe2lem12 10556 hash1n0 14374 s1nz 14561 isumltss 15804 pmtrprfvalrn 19454 gsumxp 19942 lsssn0 20934 pzriprnglem4 21474 frlmip 21768 t1connperf 23411 dissnlocfin 23504 isufil2 23883 cnextf 24041 ustuqtop1 24216 rrxip 25367 dveq0 25977 noxp1o 27641 bdayfo 27655 noetasuplem2 27712 noetasuplem4 27714 noetainflem2 27716 noetainflem4 27718 cutsun12 27796 cuteq0 27821 cuteq1 27823 cofcut1 27926 addcuts2 27985 leadds1 27995 addsuniflem 28007 addsasslem1 28009 addsasslem2 28010 negcut2 28046 mulcut2 28139 wwlksnext 29976 clwwlknon1sn 30185 esumnul 34208 bnj970 35105 filnetlem4 36579 bj-0nelsngl 37294 bj-2upln1upl 37347 dibn0 41613 diophrw 43205 dfac11 43508 fucofvalne 49812 |
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