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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 9281 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2297 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 682 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2468 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2205 ≠ wne 2414 0cc0 8143 ℕcn 9254 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 ax-setind 4664 ax-cnex 8234 ax-resscn 8235 ax-1re 8237 ax-addrcl 8240 ax-0lt1 8249 ax-0id 8251 ax-rnegex 8252 ax-pre-ltirr 8255 ax-pre-lttrn 8257 ax-pre-ltadd 8259 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-int 3955 df-br 4115 df-opab 4177 df-xp 4760 df-cnv 4762 df-iota 5317 df-fv 5365 df-ov 6061 df-pnf 8326 df-mnf 8327 df-xr 8328 df-ltxr 8329 df-le 8330 df-inn 9255 |
| This theorem is referenced by: nnne0d 9299 divfnzn 9971 qreccl 9992 fzo1fzo0n0 10544 expnnval 10928 expnegap0 10933 hashnncl 11183 ef0lem 12371 dvdsval3 12502 nndivdvds 12507 modmulconst 12534 dvdsdivcl 12561 divalg2 12637 ndvdssub 12641 nndvdslegcd 12686 divgcdz 12692 divgcdnn 12696 gcdzeq 12743 eucalgf 12777 eucalginv 12778 lcmgcdlem 12799 qredeu 12819 cncongr1 12825 cncongr2 12826 divnumden 12918 divdenle 12919 phimullem 12947 hashgcdlem 12960 phisum 12963 prm23lt5 12986 pythagtriplem8 12995 pythagtriplem9 12996 pceu 13018 pccl 13022 pcdiv 13025 pcqcl 13029 pcdvds 13038 pcndvds 13040 pcndvds2 13042 pceq0 13045 pcz 13055 pcmpt 13066 fldivp1 13071 pcfac 13073 ennnfonelemjn 13237 mulgnn 13879 mulgnegnn 13885 znf1o 14925 znfi 14929 znhash 14930 znidomb 14932 znrrg 14934 dvexp2 15703 pellexlem1 15971 lgsval4a 16021 lgsabs1 16038 lgssq2 16040 |
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