| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > elnnz1 | Structured version Visualization version GIF version | ||
| Description: Positive integer property expressed in terms of integers. (Contributed by NM, 10-May-2004.) (Proof shortened by Mario Carneiro, 16-May-2014.) |
| Ref | Expression |
|---|---|
| elnnz1 | ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnz 12738 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
| 2 | nnge1 12390 | . . 3 ⊢ (𝑁 ∈ ℕ → 1 ≤ 𝑁) | |
| 3 | 1, 2 | jca 521 | . 2 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) |
| 4 | 0lt1 11862 | . . . . 5 ⊢ 0 < 1 | |
| 5 | 0re 11334 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 6 | 1re 11332 | . . . . . 6 ⊢ 1 ∈ ℝ | |
| 7 | zre 12721 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 8 | ltletr 11426 | . . . . . 6 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((0 < 1 ∧ 1 ≤ 𝑁) → 0 < 𝑁)) | |
| 9 | 5, 6, 7, 8 | mp3an12i 1495 | . . . . 5 ⊢ (𝑁 ∈ ℤ → ((0 < 1 ∧ 1 ≤ 𝑁) → 0 < 𝑁)) |
| 10 | 4, 9 | mpani 709 | . . . 4 ⊢ (𝑁 ∈ ℤ → (1 ≤ 𝑁 → 0 < 𝑁)) |
| 11 | 10 | imdistani 579 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 1 ≤ 𝑁) → (𝑁 ∈ ℤ ∧ 0 < 𝑁)) |
| 12 | elnnz 12727 | . . 3 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁)) | |
| 13 | 11, 12 | sylibr 237 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 1 ≤ 𝑁) → 𝑁 ∈ ℕ) |
| 14 | 3, 13 | impbii 212 | 1 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∈ wcel 2147 class class class wbr 5106 ℝcr 11223 0cc0 11224 1c1 11225 < clt 11367 ≤ cle 11368 ℕcn 12359 ℤcz 12717 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7772 ax-resscn 11281 ax-1cn 11282 ax-icn 11283 ax-addcl 11284 ax-addrcl 11285 ax-mulcl 11286 ax-mulrcl 11287 ax-mulcom 11288 ax-addass 11289 ax-mulass 11290 ax-distr 11291 ax-i2m1 11292 ax-1ne0 11293 ax-1rid 11294 ax-rnegex 11295 ax-rrecex 11296 ax-cnre 11297 ax-pre-lttri 11298 ax-pre-lttrn 11299 ax-pre-ltadd 11300 ax-pre-mulgt0 11301 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6319 df-ord 6380 df-on 6381 df-lim 6382 df-suc 6383 df-iota 6509 df-fun 6557 df-fn 6558 df-f 6559 df-f1 6560 df-fo 6561 df-f1o 6562 df-fv 6563 df-riota 7397 df-ov 7443 df-oprab 7444 df-mpo 7445 df-om 7899 df-2nd 8023 df-frecs 8324 df-wrecs 8355 df-recs 8404 df-rdg 8443 df-er 8742 df-en 8999 df-dom 9000 df-sdom 9001 df-pnf 11369 df-mnf 11370 df-xr 11371 df-ltxr 11372 df-le 11373 df-sub 11567 df-neg 11568 df-nn 12360 df-z 12718 |
| This theorem is used by: znnnlt1 12747 nnzrab 12748 eluz2b2 13072 elfznn 13711 elfz1b 13751 flge1nn 13985 gcdcllem3 16697 4sqlem11 17159 ovolunlem1a 25844 ovoliunlem1 25850 ppinncl 27528 bcmono 27631 zabsle1 27650 gausslemma2dlem1a 27719 gausslemma2dlem4 27723 axlowdimlem16 29562 nndiffz1 33445 tgoldbachgnn 35355 poimirlem7 38736 lcmineqlem13 43282 unitscyglem2 43437 unitscyglem4 43439 fz1eqin 43971 lzenom 43972 dirkertrigeqlem3 47313 ceilhalfnn 48613 difltmodne 48621 gpg3kgrtriexlem4 49387 gpg3kgrtriexlem6 49389 |
| Copyright terms: Public domain | W3C validator |