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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 4731 | . 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 2144 ≠ wne 2955 Vcvv 3450 ∅c0 4278 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-dif 4047 df-nul 4279 df-sn 4585 |
| This theorem is used by: snsssn 4795 0nep0 5318 notsep 5324 nnullss 5429 snopeqop 5477 opthwiener 5486 fparlem3 8127 fparlem4 8128 1n0OLD 8499 fodomr 9150 mapdom3 9171 fodomfir 9322 ssfii 9414 marypha1lem 9428 djuexb 9993 fseqdom 10108 dfac5lem3 10207 isfin1-3 10467 axcc2lem 10517 axdc4lem 10536 fpwwe2lem12 10730 hash1n0 14569 s1nz 14757 isumltss 16022 degenmgmnfn 19141 pmtrprfvalrn 19707 gsumxp 20195 lsssn0 21228 pzriprnglem4 21795 frlmip 22089 t1connperf 23759 dissnlocfin 23853 isufil2 24232 cnextf 24390 ustuqtop1 24565 rrxip 25716 dveq0 26325 noxp1o 28025 bdayfo 28039 noetasuplem2 28096 noetasuplem4 28098 noetainflem2 28100 noetainflem4 28102 cutsun12 28181 cuteq0 28206 cuteq1 28208 cofcut1 28311 addcuts2 28370 leadds1 28380 addsuniflem 28392 addsasslem1 28394 addsasslem2 28395 negcut2 28431 mulcut2 28524 wwlksnext 30487 clwwlknon1sn 30696 esumnul 34726 bnj970 35623 filnetlem4 37261 bj-0nelsngl 37976 bj-2upln1upl 38029 dibn0 42303 diophrw 43863 dfac11 44157 fucofvalne 50540 |
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