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| Mirrors > Home > MPE Home > Th. List > eluz2b2 | Structured version Visualization version GIF version | ||
| Description: Two ways to say "an integer greater than or equal to 2". (Contributed by Paul Chapman, 23-Nov-2012.) |
| Ref | Expression |
|---|---|
| eluz2b2 | ⊢ (𝑁 ∈ (ℤ≥‘2) ↔ (𝑁 ∈ ℕ ∧ 1 < 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluz2b1 13053 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) ↔ (𝑁 ∈ ℤ ∧ 1 < 𝑁)) | |
| 2 | 1re 11315 | . . . . . . 7 ⊢ 1 ∈ ℝ | |
| 3 | zre 12704 | . . . . . . 7 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
| 4 | ltle 11405 | . . . . . . 7 ⊢ ((1 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (1 < 𝑁 → 1 ≤ 𝑁)) | |
| 5 | 2, 3, 4 | sylancr 599 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → (1 < 𝑁 → 1 ≤ 𝑁)) |
| 6 | 5 | imdistani 579 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) → (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) |
| 7 | elnnz1 12729 | . . . . 5 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 1 ≤ 𝑁)) | |
| 8 | 6, 7 | sylibr 237 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) → 𝑁 ∈ ℕ) |
| 9 | simpr 490 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) → 1 < 𝑁) | |
| 10 | 8, 9 | jca 521 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) → (𝑁 ∈ ℕ ∧ 1 < 𝑁)) |
| 11 | nnz 12721 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
| 12 | 11 | anim1i 627 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 1 < 𝑁) → (𝑁 ∈ ℤ ∧ 1 < 𝑁)) |
| 13 | 10, 12 | impbii 212 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 1 < 𝑁) ↔ (𝑁 ∈ ℕ ∧ 1 < 𝑁)) |
| 14 | 1, 13 | bitri 278 | 1 ⊢ (𝑁 ∈ (ℤ≥‘2) ↔ (𝑁 ∈ ℕ ∧ 1 < 𝑁)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∈ wcel 2144 class class class wbr 5102 ‘cfv 6543 ℝcr 11206 1c1 11208 < clt 11350 ≤ cle 11351 ℕcn 12342 2c2 12404 ℤcz 12700 ℤ≥cuz 12972 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7882 df-2nd 8006 df-frecs 8306 df-wrecs 8337 df-recs 8386 df-rdg 8425 df-er 8724 df-en 8981 df-dom 8982 df-sdom 8983 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-nn 12343 df-2 12412 df-n0 12614 df-z 12701 df-uz 12973 |
| This theorem is used by: eluz2b3 13056 nprmi 16873 ge2nprmge4 16886 pockthlem 17092 prmunb 17101 prmlem1a 17293 sylow3lem6 19855 chtge0 27448 muval1 27469 chtwordi 27492 vma1 27502 mersenne 27563 perfectlem2 27566 lgsne0 27671 chtppilimlem1 27809 padicabvcxp 27968 ostth2lem3 27971 ostth2lem4 27972 ostth2 27973 ostth3 27974 umgr2cwwkdifex 30665 ex-mod 31059 rmspecnonsq 44023 rmspecfund 44025 ltrmxnn0 44065 itgsinexp 47073 wallispilem3 47185 fmtno4prm 48768 perfectALTVlem2 48928 |
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