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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 4733 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 ≠ wne 2933 Vcvv 3442 ∅c0 4287 {csn 4582 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-dif 3906 df-nul 4288 df-sn 4583 |
| This theorem is referenced by: snsssn 4799 0nep0 5305 notzfaus 5310 nnullss 5417 snopeqop 5462 opthwiener 5470 fparlem3 8066 fparlem4 8067 1n0 8425 fodomr 9068 mapdom3 9089 fodomfir 9240 ssfii 9334 marypha1lem 9348 djuexb 9833 fseqdom 9948 dfac5lem3 10047 isfin1-3 10308 axcc2lem 10358 axdc4lem 10377 fpwwe2lem12 10565 hash1n0 14356 s1nz 14543 isumltss 15783 pmtrprfvalrn 19429 gsumxp 19917 lsssn0 20911 pzriprnglem4 21451 frlmip 21745 t1connperf 23392 dissnlocfin 23485 isufil2 23864 cnextf 24022 ustuqtop1 24197 rrxip 25358 dveq0 25973 noxp1o 27643 bdayfo 27657 noetasuplem2 27714 noetasuplem4 27716 noetainflem2 27718 noetainflem4 27720 cutsun12 27798 cuteq0 27823 cuteq1 27825 cofcut1 27928 addcuts2 27987 leadds1 27997 addsuniflem 28009 addsasslem1 28011 addsasslem2 28012 negcut2 28048 mulcut2 28141 wwlksnext 29978 clwwlknon1sn 30187 esumnul 34225 bnj970 35122 filnetlem4 36594 bj-0nelsngl 37213 bj-2upln1upl 37266 dibn0 41523 diophrw 43110 dfac11 43413 fucofvalne 49678 |
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