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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 9310 | . . 3 ⊢ ¬ 0 ∈ ℕ | |
| 2 | eleq1 2301 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ ℕ ↔ 0 ∈ ℕ)) | |
| 3 | 1, 2 | mtbiri 686 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ ℕ) |
| 4 | 3 | necon2ai 2474 | 1 ⊢ (𝐴 ∈ ℕ → 𝐴 ≠ 0) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1402 ∈ wcel 2209 ≠ wne 2420 0cc0 8169 ℕcn 9283 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1re 8263 ax-addrcl 8266 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-pre-ltirr 8281 ax-pre-lttrn 8283 ax-pre-ltadd 8285 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-xp 4775 df-cnv 4777 df-iota 5332 df-fv 5380 df-ov 6078 df-pnf 8352 df-mnf 8353 df-xr 8354 df-ltxr 8355 df-le 8356 df-inn 9284 |
| This theorem is referenced by: nnne0d 9328 divfnzn 10000 qreccl 10021 fzo1fzo0n0 10573 expnnval 10957 expnegap0 10962 hashnncl 11212 ef0lem 12405 dvdsval3 12536 nndivdvds 12541 modmulconst 12568 dvdsdivcl 12595 divalg2 12671 ndvdssub 12675 nndvdslegcd 12720 divgcdz 12726 divgcdnn 12730 gcdzeq 12777 eucalgf 12811 eucalginv 12812 lcmgcdlem 12833 qredeu 12853 cncongr1 12859 cncongr2 12860 divnumden 12952 divdenle 12953 phimullem 12981 hashgcdlem 12994 phisum 12997 prm23lt5 13020 pythagtriplem8 13029 pythagtriplem9 13030 pceu 13052 pccl 13056 pcdiv 13059 pcqcl 13063 pcdvds 13072 pcndvds 13074 pcndvds2 13076 pceq0 13079 pcz 13089 pcmpt 13100 fldivp1 13105 pcfac 13107 ennnfonelemjn 13271 mulgnn 13906 mulgnegnn 13912 znf1o 14958 znfi 14962 znhash 14963 znidomb 14965 znrrg 14967 dvexp2 15736 pellexlem1 16005 lgsval4a 16055 lgsabs1 16072 lgssq2 16074 |
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