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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 9169 | . . 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 8031 ℕcn 9142 |
| 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 8122 ax-resscn 8123 ax-1re 8125 ax-addrcl 8128 ax-0lt1 8137 ax-0id 8139 ax-rnegex 8140 ax-pre-ltirr 8143 ax-pre-lttrn 8145 ax-pre-ltadd 8147 |
| 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 6020 df-pnf 8215 df-mnf 8216 df-xr 8217 df-ltxr 8218 df-le 8219 df-inn 9143 |
| This theorem is referenced by: nnne0d 9187 divfnzn 9854 qreccl 9875 fzo1fzo0n0 10421 expnnval 10803 expnegap0 10808 hashnncl 11056 ef0lem 12220 dvdsval3 12351 nndivdvds 12356 modmulconst 12383 dvdsdivcl 12410 divalg2 12486 ndvdssub 12490 nndvdslegcd 12535 divgcdz 12541 divgcdnn 12545 gcdzeq 12592 eucalgf 12626 eucalginv 12627 lcmgcdlem 12648 qredeu 12668 cncongr1 12674 cncongr2 12675 divnumden 12767 divdenle 12768 phimullem 12796 hashgcdlem 12809 phisum 12812 prm23lt5 12835 pythagtriplem8 12844 pythagtriplem9 12845 pceu 12867 pccl 12871 pcdiv 12874 pcqcl 12878 pcdvds 12887 pcndvds 12889 pcndvds2 12891 pceq0 12894 pcz 12904 pcmpt 12915 fldivp1 12920 pcfac 12922 ennnfonelemjn 13022 mulgnn 13712 mulgnegnn 13718 znf1o 14664 znfi 14668 znhash 14669 znidomb 14671 znrrg 14673 dvexp2 15435 lgsval4a 15750 lgsabs1 15767 lgssq2 15769 |
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