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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 4735 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 ≠ wne 2956 Vcvv 3451 ∅c0 4279 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-dif 3902 df-nul 4280 df-sn 4585 |
| This theorem is used by: snsssn 4801 0nep0 5319 notsep 5325 nnullss 5430 snopeqop 5478 opthwiener 5487 fparlem3 8114 fparlem4 8115 1n0OLD 8480 fodomr 9131 mapdom3 9152 fodomfir 9303 ssfii 9395 marypha1lem 9409 djuexb 9971 fseqdom 10086 dfac5lem3 10185 isfin1-3 10445 axcc2lem 10495 axdc4lem 10514 fpwwe2lem12 10708 hash1n0 14546 s1nz 14734 isumltss 15997 degenmgmnfn 19116 pmtrprfvalrn 19682 gsumxp 20170 lsssn0 21203 pzriprnglem4 21770 frlmip 22064 t1connperf 23734 dissnlocfin 23828 isufil2 24207 cnextf 24365 ustuqtop1 24540 rrxip 25691 dveq0 26300 noxp1o 28002 bdayfo 28016 noetasuplem2 28073 noetasuplem4 28075 noetainflem2 28077 noetainflem4 28079 cutsun12 28158 cuteq0 28183 cuteq1 28185 cofcut1 28288 addcuts2 28347 leadds1 28357 addsuniflem 28369 addsasslem1 28371 addsasslem2 28372 negcut2 28408 mulcut2 28501 wwlksnext 30464 clwwlknon1sn 30673 esumnul 34662 bnj970 35560 filnetlem4 37139 bj-0nelsngl 37854 bj-2upln1upl 37907 dibn0 42178 diophrw 43723 dfac11 44022 fucofvalne 50377 |
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