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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 9160 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2292 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 679 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2454 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 ≠ wne 2400 0cc0 8022 ℕcn 9133 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8113 ax-resscn 8114 ax-1re 8116 ax-addrcl 8119 ax-0lt1 8128 ax-0id 8130 ax-rnegex 8131 ax-pre-ltirr 8134 ax-pre-lttrn 8136 ax-pre-ltadd 8138 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-br 4087 df-opab 4149 df-xp 4729 df-cnv 4731 df-iota 5284 df-fv 5332 df-ov 6016 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-inn 9134 |
| This theorem is referenced by: nnne0d 9178 divfnzn 9845 qreccl 9866 fzo1fzo0n0 10412 expnnval 10794 expnegap0 10799 hashnncl 11047 ef0lem 12211 dvdsval3 12342 nndivdvds 12347 modmulconst 12374 dvdsdivcl 12401 divalg2 12477 ndvdssub 12481 nndvdslegcd 12526 divgcdz 12532 divgcdnn 12536 gcdzeq 12583 eucalgf 12617 eucalginv 12618 lcmgcdlem 12639 qredeu 12659 cncongr1 12665 cncongr2 12666 divnumden 12758 divdenle 12759 phimullem 12787 hashgcdlem 12800 phisum 12803 prm23lt5 12826 pythagtriplem8 12835 pythagtriplem9 12836 pceu 12858 pccl 12862 pcdiv 12865 pcqcl 12869 pcdvds 12878 pcndvds 12880 pcndvds2 12882 pceq0 12885 pcz 12895 pcmpt 12906 fldivp1 12911 pcfac 12913 ennnfonelemjn 13013 mulgnn 13703 mulgnegnn 13709 znf1o 14655 znfi 14659 znhash 14660 znidomb 14662 znrrg 14664 dvexp2 15426 lgsval4a 15741 lgsabs1 15758 lgssq2 15760 |
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