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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 4740 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2106 ≠ wne 2939 Vcvv 3446 ∅c0 4287 {csn 4591 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-ext 2702 |
This theorem depends on definitions: df-bi 206 df-an 397 df-tru 1544 df-fal 1554 df-ex 1782 df-sb 2068 df-clab 2709 df-cleq 2723 df-clel 2809 df-ne 2940 df-dif 3916 df-nul 4288 df-sn 4592 |
This theorem is referenced by: snsssn 4804 0nep0 5318 notzfaus 5323 nnullss 5424 snopeqop 5468 opthwiener 5476 fparlem3 8051 fparlem4 8052 1n0 8439 fodomr 9079 mapdom3 9100 ssfii 9364 marypha1lem 9378 djuexb 9854 fseqdom 9971 dfac5lem3 10070 isfin1-3 10331 axcc2lem 10381 axdc4lem 10400 fpwwe2lem12 10587 hash1n0 14331 s1nz 14507 isumltss 15744 0subgOLD 18968 pmtrprfvalrn 19284 gsumxp 19767 lsssn0 20465 frlmip 21221 t1connperf 22824 dissnlocfin 22917 isufil2 23296 cnextf 23454 ustuqtop1 23630 rrxip 24791 dveq0 25401 noxp1o 27048 bdayfo 27062 noetasuplem2 27119 noetasuplem4 27121 noetainflem2 27123 noetainflem4 27125 scutun12 27192 cuteq0 27214 cofcut1 27282 sleadd1 27341 addsunif 27353 addsasslem1 27354 addsasslem2 27355 negscut2 27381 wwlksnext 28901 clwwlknon1sn 29107 esumnul 32736 bnj970 33648 filnetlem4 34929 bj-0nelsngl 35515 bj-2upln1upl 35568 dibn0 39689 diophrw 41140 dfac11 41447 |
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