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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 4703 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 ≠ wne 3016 Vcvv 3494 ∅c0 4290 {csn 4560 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-dif 3938 df-nul 4291 df-sn 4561 |
This theorem is referenced by: snsssn 4765 0nep0 5250 notzfaus 5254 notzfausOLD 5255 nnullss 5346 snopeqop 5388 opthwiener 5396 fparlem3 7803 fparlem4 7804 1n0 8113 fodomr 8662 mapdom3 8683 ssfii 8877 marypha1lem 8891 djuexb 9332 fseqdom 9446 dfac5lem3 9545 isfin1-3 9802 axcc2lem 9852 axdc4lem 9871 fpwwe2lem13 10058 hash1n0 13776 s1nz 13955 isumltss 15197 0subg 18298 pmtrprfvalrn 18610 gsumxp 19090 lsssn0 19713 frlmip 20916 t1connperf 22038 dissnlocfin 22131 isufil2 22510 cnextf 22668 ustuqtop1 22844 rrxip 23987 dveq0 24591 wwlksnext 27665 clwwlknon1sn 27873 esumnul 31302 bnj970 32214 noxp1o 33165 bdayfo 33177 noetalem3 33214 noetalem4 33215 scutun12 33266 filnetlem4 33724 bj-0nelsngl 34278 bj-2upln1upl 34331 dibn0 38283 diophrw 39349 dfac11 39655 |
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