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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 9503 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℕ0) | |
| 2 | nngt0 9262 | . . 3 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁) | |
| 3 | 1, 2 | jca 306 | . 2 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℕ0 ∧ 0 < 𝑁)) |
| 4 | elnn0 9498 | . . . 4 ⊢ (𝑁 ∈ ℕ0 ↔ (𝑁 ∈ ℕ ∨ 𝑁 = 0)) | |
| 5 | ax-1 6 | . . . . 5 ⊢ (𝑁 ∈ ℕ → (0 < 𝑁 → 𝑁 ∈ ℕ)) | |
| 6 | breq2 4113 | . . . . . 6 ⊢ (𝑁 = 0 → (0 < 𝑁 ↔ 0 < 0)) | |
| 7 | 0re 8274 | . . . . . . . 8 ⊢ 0 ∈ ℝ | |
| 8 | 7 | ltnri 8366 | . . . . . . 7 ⊢ ¬ 0 < 0 |
| 9 | 8 | pm2.21i 651 | . . . . . 6 ⊢ (0 < 0 → 𝑁 ∈ ℕ) |
| 10 | 6, 9 | biimtrdi 163 | . . . . 5 ⊢ (𝑁 = 0 → (0 < 𝑁 → 𝑁 ∈ ℕ)) |
| 11 | 5, 10 | jaoi 724 | . . . 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 716 = wceq 1398 ∈ wcel 2203 class class class wbr 4109 0cc0 8127 < clt 8308 ℕcn 9237 ℕ0cn0 9496 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-cnex 8218 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-i2m1 8232 ax-0lt1 8233 ax-0id 8235 ax-rnegex 8236 ax-pre-ltirr 8239 ax-pre-ltwlin 8240 ax-pre-lttrn 8241 ax-pre-ltadd 8243 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-rab 2529 df-v 2815 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-int 3950 df-br 4110 df-opab 4172 df-xp 4755 df-cnv 4757 df-iota 5312 df-fv 5360 df-ov 6053 df-pnf 8310 df-mnf 8311 df-xr 8312 df-ltxr 8313 df-le 8314 df-inn 9238 df-n0 9497 |
| This theorem is referenced by: elnnnn0c 9541 nn0p1elfzo 10521 bccl2 11130 ccatfv0 11291 ccat2s1fvwd 11335 swrdswrd 11397 bezoutlemmain 12694 |
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