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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 4308 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1990 ≠ wne 2794 Vcvv 3200 ∅c0 3915 {csn 4177 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-v 3202 df-dif 3577 df-nul 3916 df-sn 4178 |
This theorem is referenced by: snsssn 4372 0nep0 4836 notzfaus 4840 nnullss 4930 opthwiener 4976 fparlem3 7279 fparlem4 7280 1n0 7575 fodomr 8111 mapdom3 8132 ssfii 8325 marypha1lem 8339 fseqdom 8849 dfac5lem3 8948 isfin1-3 9208 axcc2lem 9258 axdc4lem 9277 fpwwe2lem13 9464 hash1n0 13209 s1nz 13386 isumltss 14580 0subg 17619 pmtrprfvalrn 17908 gsumxp 18375 lsssn0 18948 frlmip 20117 t1connperf 21239 dissnlocfin 21332 isufil2 21712 cnextf 21870 ustuqtop1 22045 rrxip 23178 dveq0 23763 wwlksnext 26788 esumnul 30110 bnj970 31017 noxp1o 31816 bdayfo 31828 noetalem3 31865 noetalem4 31866 scutun12 31917 filnetlem4 32376 bj-0nelsngl 32959 bj-2upln1upl 33012 dibn0 36442 diophrw 37322 dfac11 37632 |
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