| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 2147 ≠ wne 2959 Vcvv 3454 ∅c0 4281 {csn 4588 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-dif 4050 df-nul 4282 df-sn 4589 |
| This theorem is used by: snsssn 4799 0nep0 5324 notsep 5330 nnullss 5435 snopeqop 5483 opthwiener 5492 fparlem3 8155 fparlem4 8156 1n0OLD 8527 fodomr 9178 mapdom3 9199 fodomfir 9350 ssfii 9441 marypha1lem 9455 djuexb 10020 fseqdom 10135 dfac5lem3 10234 isfin1-3 10494 axcc2lem 10544 axdc4lem 10563 fpwwe2lem12 10757 hash1n0 14596 s1nz 14784 isumltss 16049 degenmgmnfn 19168 pmtrprfvalrn 19735 gsumxp 20223 lsssn0 21256 pzriprnglem4 21823 frlmip 22117 t1connperf 23787 dissnlocfin 23881 isufil2 24260 cnextf 24418 ustuqtop1 24593 rrxip 25744 dveq0 26353 noxp1o 28053 bdayfo 28067 noetasuplem2 28124 noetasuplem4 28126 noetainflem2 28128 noetainflem4 28130 cutsun12 28209 cuteq0 28234 cuteq1 28236 cofcut1 28339 addcuts2 28398 leadds1 28408 addsuniflem 28420 addsasslem1 28422 addsasslem2 28423 negcut2 28459 mulcut2 28552 wwlksnext 30515 clwwlknon1sn 30724 esumnul 34763 bnj970 35660 filnetlem4 37360 bj-0nelsngl 38075 bj-2upln1upl 38128 dibn0 42413 diophrw 43974 dfac11 44268 fucofvalne 50662 |
| Copyright terms: Public domain | W3C validator |