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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 9170 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2294 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 681 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2456 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1397 ∈ wcel 2202 ≠ wne 2402 0cc0 8032 ℕcn 9143 |
| 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 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-cnex 8123 ax-resscn 8124 ax-1re 8126 ax-addrcl 8129 ax-0lt1 8138 ax-0id 8140 ax-rnegex 8141 ax-pre-ltirr 8144 ax-pre-lttrn 8146 ax-pre-ltadd 8148 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-rab 2519 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-int 3929 df-br 4089 df-opab 4151 df-xp 4731 df-cnv 4733 df-iota 5286 df-fv 5334 df-ov 6021 df-pnf 8216 df-mnf 8217 df-xr 8218 df-ltxr 8219 df-le 8220 df-inn 9144 |
| This theorem is referenced by: nnne0d 9188 divfnzn 9855 qreccl 9876 fzo1fzo0n0 10423 expnnval 10805 expnegap0 10810 hashnncl 11058 ef0lem 12239 dvdsval3 12370 nndivdvds 12375 modmulconst 12402 dvdsdivcl 12429 divalg2 12505 ndvdssub 12509 nndvdslegcd 12554 divgcdz 12560 divgcdnn 12564 gcdzeq 12611 eucalgf 12645 eucalginv 12646 lcmgcdlem 12667 qredeu 12687 cncongr1 12693 cncongr2 12694 divnumden 12786 divdenle 12787 phimullem 12815 hashgcdlem 12828 phisum 12831 prm23lt5 12854 pythagtriplem8 12863 pythagtriplem9 12864 pceu 12886 pccl 12890 pcdiv 12893 pcqcl 12897 pcdvds 12906 pcndvds 12908 pcndvds2 12910 pceq0 12913 pcz 12923 pcmpt 12934 fldivp1 12939 pcfac 12941 ennnfonelemjn 13041 mulgnn 13731 mulgnegnn 13737 znf1o 14684 znfi 14688 znhash 14689 znidomb 14691 znrrg 14693 dvexp2 15455 lgsval4a 15770 lgsabs1 15787 lgssq2 15789 |
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