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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 9333 | . . 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 |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ∈ wcel 2209 ≠ wne 2420 0cc0 8179 ℕcn 9306 |
| This proof depends on 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 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1re 8273 ax-addrcl 8276 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-pre-ltirr 8291 ax-pre-lttrn 8293 ax-pre-ltadd 8295 |
| This proof 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 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-opab 4193 df-xp 4780 df-cnv 4782 df-iota 5337 df-fv 5385 df-ov 6088 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-inn 9307 |
| This theorem is used by: nnne0d 9351 divfnzn 10030 qreccl 10051 fzo1fzo0n0 10605 expnnval 10992 expnegap0 10997 hashnncl 11248 ef0lem 12443 dvdsval3 12574 nndivdvds 12579 modmulconst 12606 dvdsdivcl 12633 divalg2 12709 ndvdssub 12713 nndvdslegcd 12758 divgcdz 12764 divgcdnn 12768 gcdzeq 12815 eucalgf 12849 eucalginv 12850 lcmgcdlem 12871 qredeu 12891 cncongr1 12897 cncongr2 12898 divnumden 12992 divdenle 12993 phimullem 13023 hashgcdlem 13036 phisum 13039 prm23lt5 13062 pythagtriplem8 13071 pythagtriplem9 13072 pceu 13094 pccl 13098 pcdiv 13101 pcqcl 13105 pcdvds 13114 pcndvds 13116 pcndvds2 13118 pceq0 13121 pcz 13131 pcmpt 13142 fldivp1 13147 pcfac 13149 ennnfonelemjn 13342 mulgnn 13978 mulgnegnn 13984 znf1o 15035 znfi 15039 znhash 15040 znidomb 15042 znrrg 15044 dvexp2 15862 pellexlem1 16148 lgsval4a 16239 lgsabs1 16256 lgssq2 16258 |
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