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| Mirrors > Home > MPE Home > Th. List > nnge2recico01 | Structured version Visualization version GIF version | ||
| Description: The reciprocal of an integer greater than 1 is in the right open interval between 0 and 1. (Contributed by AV, 10-Apr-2026.) |
| Ref | Expression |
|---|---|
| nnge2recico01 | ⊢ (𝑁 ∈ (ℤ≥‘2) → (1 / 𝑁) ∈ (0[,)1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluzelre 13003 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 𝑁 ∈ ℝ) | |
| 2 | eluz2n0 13047 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 𝑁 ≠ 0) | |
| 3 | 1, 2 | rereccld 12171 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) → (1 / 𝑁) ∈ ℝ) |
| 4 | 1red 11336 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 1 ∈ ℝ) | |
| 5 | 0le1 11866 | . . . 4 ⊢ 0 ≤ 1 | |
| 6 | 5 | a1i 11 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 0 ≤ 1) |
| 7 | eluz2nn 13042 | . . . 4 ⊢ (𝑁 ∈ (ℤ≥‘2) → 𝑁 ∈ ℕ) | |
| 8 | 7 | nngt0d 12414 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 0 < 𝑁) |
| 9 | divge0 12213 | . . 3 ⊢ (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ (𝑁 ∈ ℝ ∧ 0 < 𝑁)) → 0 ≤ (1 / 𝑁)) | |
| 10 | 4, 6, 1, 8, 9 | syl22anc 852 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) → 0 ≤ (1 / 𝑁)) |
| 11 | eluz2gt1 13074 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → 1 < 𝑁) | |
| 12 | recgt1 12240 | . . . 4 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → (1 < 𝑁 ↔ (1 / 𝑁) < 1)) | |
| 13 | 1, 8, 12 | syl2anc 596 | . . 3 ⊢ (𝑁 ∈ (ℤ≥‘2) → (1 < 𝑁 ↔ (1 / 𝑁) < 1)) |
| 14 | 11, 13 | mpbid 235 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) → (1 / 𝑁) < 1) |
| 15 | 0re 11337 | . . . 4 ⊢ 0 ∈ ℝ | |
| 16 | 1xr 11395 | . . . 4 ⊢ 1 ∈ ℝ* | |
| 17 | 15, 16 | pm3.2i 476 | . . 3 ⊢ (0 ∈ ℝ ∧ 1 ∈ ℝ*) |
| 18 | elico2 13568 | . . 3 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ*) → ((1 / 𝑁) ∈ (0[,)1) ↔ ((1 / 𝑁) ∈ ℝ ∧ 0 ≤ (1 / 𝑁) ∧ (1 / 𝑁) < 1))) | |
| 19 | 17, 18 | mp1i 14 | . 2 ⊢ (𝑁 ∈ (ℤ≥‘2) → ((1 / 𝑁) ∈ (0[,)1) ↔ ((1 / 𝑁) ∈ ℝ ∧ 0 ≤ (1 / 𝑁) ∧ (1 / 𝑁) < 1))) |
| 20 | 3, 10, 14, 19 | mpbir3and 1361 | 1 ⊢ (𝑁 ∈ (ℤ≥‘2) → (1 / 𝑁) ∈ (0[,)1)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 ∈ wcel 2147 class class class wbr 5106 ‘cfv 6558 (class class class)co 7443 ℝcr 11226 0cc0 11227 1c1 11228 ℝ*cxr 11369 < clt 11370 ≤ cle 11371 / cdiv 12000 2c2 12424 ℤ≥cuz 12992 [,)cico 13505 |
| 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 7775 ax-cnex 11283 ax-resscn 11284 ax-1cn 11285 ax-icn 11286 ax-addcl 11287 ax-addrcl 11288 ax-mulcl 11289 ax-mulrcl 11290 ax-mulcom 11291 ax-addass 11292 ax-mulass 11293 ax-distr 11294 ax-i2m1 11295 ax-1ne0 11296 ax-1rid 11297 ax-rnegex 11298 ax-rrecex 11299 ax-cnre 11300 ax-pre-lttri 11301 ax-pre-lttrn 11302 ax-pre-ltadd 11303 ax-pre-mulgt0 11304 |
| 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-rmo 3369 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 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-om 7902 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-er 8745 df-en 9002 df-dom 9003 df-sdom 9004 df-pnf 11372 df-mnf 11373 df-xr 11374 df-ltxr 11375 df-le 11376 df-sub 11570 df-neg 11571 df-div 12001 df-nn 12363 df-2 12432 df-n0 12634 df-z 12721 df-uz 12993 df-ico 13509 |
| This theorem is used by: nnge2recfl0 48617 |
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