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| Mirrors > Home > ILE Home > Th. List > nnne0 | GIF version | ||
| Description: A positive integer is nonzero. (Contributed by NM, 27-Sep-1999.) |
| Ref | Expression |
|---|---|
| nnne0 | ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nnn 9212 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2294 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 682 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2457 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2202 ≠ wne 2403 0cc0 8075 ℕcn 9185 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-1re 8169 ax-addrcl 8172 ax-0lt1 8181 ax-0id 8183 ax-rnegex 8184 ax-pre-ltirr 8187 ax-pre-lttrn 8189 ax-pre-ltadd 8191 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-br 4094 df-opab 4156 df-xp 4737 df-cnv 4739 df-iota 5293 df-fv 5341 df-ov 6031 df-pnf 8258 df-mnf 8259 df-xr 8260 df-ltxr 8261 df-le 8262 df-inn 9186 |
| This theorem is referenced by: nnne0d 9230 divfnzn 9899 qreccl 9920 fzo1fzo0n0 10468 expnnval 10850 expnegap0 10855 hashnncl 11103 ef0lem 12284 dvdsval3 12415 nndivdvds 12420 modmulconst 12447 dvdsdivcl 12474 divalg2 12550 ndvdssub 12554 nndvdslegcd 12599 divgcdz 12605 divgcdnn 12609 gcdzeq 12656 eucalgf 12690 eucalginv 12691 lcmgcdlem 12712 qredeu 12732 cncongr1 12738 cncongr2 12739 divnumden 12831 divdenle 12832 phimullem 12860 hashgcdlem 12873 phisum 12876 prm23lt5 12899 pythagtriplem8 12908 pythagtriplem9 12909 pceu 12931 pccl 12935 pcdiv 12938 pcqcl 12942 pcdvds 12951 pcndvds 12953 pcndvds2 12955 pceq0 12958 pcz 12968 pcmpt 12979 fldivp1 12984 pcfac 12986 ennnfonelemjn 13086 mulgnn 13776 mulgnegnn 13782 znf1o 14730 znfi 14734 znhash 14735 znidomb 14737 znrrg 14739 dvexp2 15506 pellexlem1 15774 lgsval4a 15824 lgsabs1 15841 lgssq2 15843 |
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