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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 4745 | . 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 2146 ≠ wne 2961 Vcvv 3458 ∅c0 4289 {csn 4594 |
| 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 2148 ax-9 2156 ax-ext 2738 |
| 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 2745 df-cleq 2758 df-clel 2841 df-ne 2962 df-dif 3911 df-nul 4290 df-sn 4595 |
| This theorem is used by: snsssn 4811 0nep0 5333 notsep 5339 nnullss 5448 snopeqop 5494 opthwiener 5502 fparlem3 8118 fparlem4 8119 1n0OLD 8482 fodomr 9126 mapdom3 9147 fodomfir 9297 ssfii 9389 marypha1lem 9403 djuexb 9914 fseqdom 10029 dfac5lem3 10128 isfin1-3 10388 axcc2lem 10438 axdc4lem 10457 fpwwe2lem12 10645 hash1n0 14478 s1nz 14666 isumltss 15928 pmtrprfvalrn 19589 gsumxp 20077 lsssn0 21106 pzriprnglem4 21671 frlmip 21965 t1connperf 23630 dissnlocfin 23723 isufil2 24102 cnextf 24260 ustuqtop1 24435 rrxip 25586 dveq0 26196 noxp1o 27864 bdayfo 27878 noetasuplem2 27935 noetasuplem4 27937 noetainflem2 27939 noetainflem4 27941 cutsun12 28020 cuteq0 28045 cuteq1 28047 cofcut1 28150 addcuts2 28209 leadds1 28219 addsuniflem 28231 addsasslem1 28233 addsasslem2 28234 negcut2 28270 mulcut2 28363 wwlksnext 30279 clwwlknon1sn 30488 esumnul 34469 bnj970 35367 filnetlem4 36933 bj-0nelsngl 37648 bj-2upln1upl 37701 dibn0 41968 diophrw 43531 dfac11 43830 fucofvalne 50144 |
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