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| Mirrors > Home > ILE Home > Th. List > elnnnn0b | GIF version | ||
| Description: The positive integer property expressed in terms of nonnegative integers. (Contributed by NM, 1-Sep-2005.) |
| Ref | Expression |
|---|---|
| elnnnn0b | ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℕ0 ∧ 0 < 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnnn0 9301 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ0) | |
| 2 | nngt0 9060 | . . 3 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
| 3 | 1, 2 | jca 306 | . 2 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℕ0 ∧ 0 < 𝑁)) |
| 4 | elnn0 9296 | . . . 4 ⊢ (𝑁 ∈ ℕ0 ↔ (𝑁 ∈ ℕ ∨ 𝑁 = 0)) | |
| 5 | ax-1 6 | . . . . 5 ⊢ (𝑁 ∈ ℕ → (0 < 𝑁 → 𝑁 ∈ ℕ)) | |
| 6 | breq2 4047 | . . . . . 6 ⊢ (𝑁 = 0 → (0 < 𝑁 ↔ 0 < 0)) | |
| 7 | 0re 8071 | . . . . . . . 8 ⊢ 0 ∈ ℝ | |
| 8 | 7 | ltnri 8164 | . . . . . . 7 ⊢ ¬ 0 < 0 |
| 9 | 8 | pm2.21i 647 | . . . . . 6 ⊢ (0 < 0 → 𝑁 ∈ ℕ) |
| 10 | 6, 9 | biimtrdi 163 | . . . . 5 ⊢ (𝑁 = 0 → (0 < 𝑁 → 𝑁 ∈ ℕ)) |
| 11 | 5, 10 | jaoi 717 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∨ 𝑁 = 0) → (0 < 𝑁 → 𝑁 ∈ ℕ)) |
| 12 | 4, 11 | sylbi 121 | . . 3 ⊢ (𝑁 ∈ ℕ0 → (0 < 𝑁 → 𝑁 ∈ ℕ)) |
| 13 | 12 | imp 124 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 0 < 𝑁) → 𝑁 ∈ ℕ) |
| 14 | 3, 13 | impbii 126 | 1 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℕ0 ∧ 0 < 𝑁)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∨ wo 709 = wceq 1372 ∈ wcel 2175 class class class wbr 4043 0cc0 7924 < clt 8106 ℕcn 9035 ℕ0cn0 9294 |
| 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 615 ax-in2 616 ax-io 710 ax-5 1469 ax-7 1470 ax-gen 1471 ax-ie1 1515 ax-ie2 1516 ax-8 1526 ax-10 1527 ax-11 1528 ax-i12 1529 ax-bndl 1531 ax-4 1532 ax-17 1548 ax-i9 1552 ax-ial 1556 ax-i5r 1557 ax-13 2177 ax-14 2178 ax-ext 2186 ax-sep 4161 ax-pow 4217 ax-pr 4252 ax-un 4479 ax-setind 4584 ax-cnex 8015 ax-resscn 8016 ax-1cn 8017 ax-1re 8018 ax-icn 8019 ax-addcl 8020 ax-addrcl 8021 ax-mulcl 8022 ax-i2m1 8029 ax-0lt1 8030 ax-0id 8032 ax-rnegex 8033 ax-pre-ltirr 8036 ax-pre-ltwlin 8037 ax-pre-lttrn 8038 ax-pre-ltadd 8040 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1375 df-fal 1378 df-nf 1483 df-sb 1785 df-eu 2056 df-mo 2057 df-clab 2191 df-cleq 2197 df-clel 2200 df-nfc 2336 df-ne 2376 df-nel 2471 df-ral 2488 df-rex 2489 df-rab 2492 df-v 2773 df-dif 3167 df-un 3169 df-in 3171 df-ss 3178 df-pw 3617 df-sn 3638 df-pr 3639 df-op 3641 df-uni 3850 df-int 3885 df-br 4044 df-opab 4105 df-xp 4680 df-cnv 4682 df-iota 5231 df-fv 5278 df-ov 5946 df-pnf 8108 df-mnf 8109 df-xr 8110 df-ltxr 8111 df-le 8112 df-inn 9036 df-n0 9295 |
| This theorem is referenced by: elnnnn0c 9339 bccl2 10911 ccatfv0 11057 bezoutlemmain 12261 |
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