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Mirrors > Home > ILE Home > Th. List > elnnz | GIF version |
Description: Positive integer property expressed in terms of integers. (Contributed by NM, 8-Jan-2002.) |
Ref | Expression |
---|---|
elnnz | ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnre 8860 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ) | |
2 | orc 702 | . . . 4 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) | |
3 | nngt0 8878 | . . . 4 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
4 | 1, 2, 3 | jca31 307 | . . 3 ⊢ (𝑁 ∈ ℕ → ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁)) |
5 | idd 21 | . . . . . . 7 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → (𝑁 ∈ ℕ → 𝑁 ∈ ℕ)) | |
6 | lt0neg2 8363 | . . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 ↔ -𝑁 < 0)) | |
7 | renegcl 8155 | . . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℝ → -𝑁 ∈ ℝ) | |
8 | 0re 7895 | . . . . . . . . . . . . 13 ⊢ 0 ∈ ℝ | |
9 | ltnsym 7980 | . . . . . . . . . . . . 13 ⊢ ((-𝑁 ∈ ℝ ∧ 0 ∈ ℝ) → (-𝑁 < 0 → ¬ 0 < -𝑁)) | |
10 | 7, 8, 9 | sylancl 410 | . . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℝ → (-𝑁 < 0 → ¬ 0 < -𝑁)) |
11 | 6, 10 | sylbid 149 | . . . . . . . . . . 11 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 → ¬ 0 < -𝑁)) |
12 | 11 | imp 123 | . . . . . . . . . 10 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ 0 < -𝑁) |
13 | nngt0 8878 | . . . . . . . . . 10 ⊢ (-𝑁 ∈ ℕ → 0 < -𝑁) | |
14 | 12, 13 | nsyl 618 | . . . . . . . . 9 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ -𝑁 ∈ ℕ) |
15 | gt0ne0 8321 | . . . . . . . . . 10 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → 𝑁 ≠ 0) | |
16 | 15 | neneqd 2356 | . . . . . . . . 9 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ 𝑁 = 0) |
17 | ioran 742 | . . . . . . . . 9 ⊢ (¬ (-𝑁 ∈ ℕ ∨ 𝑁 = 0) ↔ (¬ -𝑁 ∈ ℕ ∧ ¬ 𝑁 = 0)) | |
18 | 14, 16, 17 | sylanbrc 414 | . . . . . . . 8 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) |
19 | 18 | pm2.21d 609 | . . . . . . 7 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ((-𝑁 ∈ ℕ ∨ 𝑁 = 0) → 𝑁 ∈ ℕ)) |
20 | 5, 19 | jaod 707 | . . . . . 6 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → 𝑁 ∈ ℕ)) |
21 | 20 | ex 114 | . . . . 5 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → 𝑁 ∈ ℕ))) |
22 | 21 | com23 78 | . . . 4 ⊢ (𝑁 ∈ ℝ → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → (0 < 𝑁 → 𝑁 ∈ ℕ))) |
23 | 22 | imp31 254 | . . 3 ⊢ (((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁) → 𝑁 ∈ ℕ) |
24 | 4, 23 | impbii 125 | . 2 ⊢ (𝑁 ∈ ℕ ↔ ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁)) |
25 | elz 9189 | . . . 4 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ))) | |
26 | 3orrot 974 | . . . . . 6 ⊢ ((𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ) ↔ (𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ ∨ 𝑁 = 0)) | |
27 | 3orass 971 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ ∨ 𝑁 = 0) ↔ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) | |
28 | 26, 27 | bitri 183 | . . . . 5 ⊢ ((𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ) ↔ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) |
29 | 28 | anbi2i 453 | . . . 4 ⊢ ((𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ)) ↔ (𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)))) |
30 | 25, 29 | bitri 183 | . . 3 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)))) |
31 | 30 | anbi1i 454 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 0 < 𝑁) ↔ ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁)) |
32 | 24, 31 | bitr4i 186 | 1 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ↔ wb 104 ∨ wo 698 ∨ w3o 967 = wceq 1343 ∈ wcel 2136 class class class wbr 3981 ℝcr 7748 0cc0 7749 < clt 7929 -cneg 8066 ℕcn 8853 ℤcz 9187 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4099 ax-pow 4152 ax-pr 4186 ax-un 4410 ax-setind 4513 ax-cnex 7840 ax-resscn 7841 ax-1cn 7842 ax-1re 7843 ax-icn 7844 ax-addcl 7845 ax-addrcl 7846 ax-mulcl 7847 ax-addcom 7849 ax-addass 7851 ax-distr 7853 ax-i2m1 7854 ax-0lt1 7855 ax-0id 7857 ax-rnegex 7858 ax-cnre 7860 ax-pre-ltirr 7861 ax-pre-ltwlin 7862 ax-pre-lttrn 7863 ax-pre-ltadd 7865 |
This theorem depends on definitions: df-bi 116 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2296 df-ne 2336 df-nel 2431 df-ral 2448 df-rex 2449 df-reu 2450 df-rab 2452 df-v 2727 df-sbc 2951 df-dif 3117 df-un 3119 df-in 3121 df-ss 3128 df-pw 3560 df-sn 3581 df-pr 3582 df-op 3584 df-uni 3789 df-int 3824 df-br 3982 df-opab 4043 df-id 4270 df-xp 4609 df-rel 4610 df-cnv 4611 df-co 4612 df-dm 4613 df-iota 5152 df-fun 5189 df-fv 5195 df-riota 5797 df-ov 5844 df-oprab 5845 df-mpo 5846 df-pnf 7931 df-mnf 7932 df-xr 7933 df-ltxr 7934 df-le 7935 df-sub 8067 df-neg 8068 df-inn 8854 df-z 9188 |
This theorem is referenced by: nnssz 9204 elnnz1 9210 znnsub 9238 nn0ge0div 9274 msqznn 9287 elpq 9582 elfz1b 10021 lbfzo0 10112 fzo1fzo0n0 10114 elfzo0z 10115 fzofzim 10119 elfzodifsumelfzo 10132 exp3val 10453 nnesq 10570 nnabscl 11038 cvgratnnlemabsle 11464 p1modz1 11730 nndivdvds 11732 zdvdsdc 11748 oddge22np1 11814 evennn2n 11816 nno 11839 nnoddm1d2 11843 divalglemex 11855 divalglemeuneg 11856 divalg 11857 ndvdsadd 11864 sqgcd 11958 qredeu 12025 prmind2 12048 sqrt2irrlem 12089 sqrt2irrap 12108 qgt0numnn 12127 oddprm 12187 pythagtriplem6 12198 pythagtriplem11 12202 pythagtriplem13 12204 pythagtriplem19 12210 pc2dvds 12257 pcadd 12267 2sqlem8 13559 |
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