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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 4251 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 ≠ wne 2780 Vcvv 3173 ∅c0 3874 {csn 4125 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-v 3175 df-dif 3543 df-nul 3875 df-sn 4126 |
This theorem is referenced by: snsssn 4312 0nep0 4762 notzfaus 4766 nnullss 4857 opthwiener 4901 fparlem3 7166 fparlem4 7167 1n0 7462 fodomr 7996 mapdom3 8017 ssfii 8208 marypha1lem 8222 fseqdom 8732 dfac5lem3 8831 isfin1-3 9091 axcc2lem 9141 axdc4lem 9160 fpwwe2lem13 9343 s1nz 13239 isumltss 14419 0subg 17442 pmtrprfvalrn 17731 gsumxp 18198 lsssn0 18769 frlmip 19936 t1conperf 21049 dissnlocfin 21142 isufil2 21522 cnextf 21680 ustuqtop1 21855 rrxip 22986 dveq0 23567 wwlknext 26252 esumnul 29437 bnj970 30271 bdayfo 31074 nobndlem3 31093 filnetlem4 31546 bj-0nelsngl 32152 bj-2upln1upl 32205 dibn0 35460 diophrw 36340 dfac11 36650 hash1n0 40370 wwlksnext 41099 |
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