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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 9172 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2293 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 681 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2455 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1397 ∈ wcel 2201 ≠ wne 2401 0cc0 8034 ℕcn 9145 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4206 ax-pow 4263 ax-pr 4298 ax-un 4529 ax-setind 4634 ax-cnex 8125 ax-resscn 8126 ax-1re 8128 ax-addrcl 8131 ax-0lt1 8140 ax-0id 8142 ax-rnegex 8143 ax-pre-ltirr 8146 ax-pre-lttrn 8148 ax-pre-ltadd 8150 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-nel 2497 df-ral 2514 df-rex 2515 df-rab 2518 df-v 2803 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-pw 3653 df-sn 3674 df-pr 3675 df-op 3677 df-uni 3893 df-int 3928 df-br 4088 df-opab 4150 df-xp 4730 df-cnv 4732 df-iota 5285 df-fv 5333 df-ov 6023 df-pnf 8218 df-mnf 8219 df-xr 8220 df-ltxr 8221 df-le 8222 df-inn 9146 |
| This theorem is referenced by: nnne0d 9190 divfnzn 9857 qreccl 9878 fzo1fzo0n0 10425 expnnval 10807 expnegap0 10812 hashnncl 11060 ef0lem 12241 dvdsval3 12372 nndivdvds 12377 modmulconst 12404 dvdsdivcl 12431 divalg2 12507 ndvdssub 12511 nndvdslegcd 12556 divgcdz 12562 divgcdnn 12566 gcdzeq 12613 eucalgf 12647 eucalginv 12648 lcmgcdlem 12669 qredeu 12689 cncongr1 12695 cncongr2 12696 divnumden 12788 divdenle 12789 phimullem 12817 hashgcdlem 12830 phisum 12833 prm23lt5 12856 pythagtriplem8 12865 pythagtriplem9 12866 pceu 12888 pccl 12892 pcdiv 12895 pcqcl 12899 pcdvds 12908 pcndvds 12910 pcndvds2 12912 pceq0 12915 pcz 12925 pcmpt 12936 fldivp1 12941 pcfac 12943 ennnfonelemjn 13043 mulgnn 13733 mulgnegnn 13739 znf1o 14686 znfi 14690 znhash 14691 znidomb 14693 znrrg 14695 dvexp2 15462 lgsval4a 15777 lgsabs1 15794 lgssq2 15796 |
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