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Mirrors > Home > ILE Home > Th. List > recnz | GIF version |
Description: The reciprocal of a number greater than 1 is not an integer. (Contributed by NM, 3-May-2005.) |
Ref | Expression |
---|---|
recnz | ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ¬ (1 / 𝐴) ∈ ℤ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | recgt1i 8649 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (0 < (1 / 𝐴) ∧ (1 / 𝐴) < 1)) | |
2 | 1 | simprd 113 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) < 1) |
3 | 1 | simpld 111 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 0 < (1 / 𝐴)) |
4 | zgt0ge1 9105 | . . . 4 ⊢ ((1 / 𝐴) ∈ ℤ → (0 < (1 / 𝐴) ↔ 1 ≤ (1 / 𝐴))) | |
5 | 3, 4 | syl5ibcom 154 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ((1 / 𝐴) ∈ ℤ → 1 ≤ (1 / 𝐴))) |
6 | 1re 7758 | . . . 4 ⊢ 1 ∈ ℝ | |
7 | 0lt1 7882 | . . . . . . . 8 ⊢ 0 < 1 | |
8 | 0re 7759 | . . . . . . . . 9 ⊢ 0 ∈ ℝ | |
9 | lttr 7831 | . . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) | |
10 | 8, 6, 9 | mp3an12 1305 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) |
11 | 7, 10 | mpani 426 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (1 < 𝐴 → 0 < 𝐴)) |
12 | 11 | imdistani 441 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (𝐴 ∈ ℝ ∧ 0 < 𝐴)) |
13 | gt0ap0 8381 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 # 0) | |
14 | 12, 13 | syl 14 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 𝐴 # 0) |
15 | rerecclap 8483 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (1 / 𝐴) ∈ ℝ) | |
16 | 14, 15 | syldan 280 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) ∈ ℝ) |
17 | lenlt 7833 | . . . 4 ⊢ ((1 ∈ ℝ ∧ (1 / 𝐴) ∈ ℝ) → (1 ≤ (1 / 𝐴) ↔ ¬ (1 / 𝐴) < 1)) | |
18 | 6, 16, 17 | sylancr 410 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 ≤ (1 / 𝐴) ↔ ¬ (1 / 𝐴) < 1)) |
19 | 5, 18 | sylibd 148 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ((1 / 𝐴) ∈ ℤ → ¬ (1 / 𝐴) < 1)) |
20 | 2, 19 | mt2d 614 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ¬ (1 / 𝐴) ∈ ℤ) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ↔ wb 104 ∈ wcel 1480 class class class wbr 3924 (class class class)co 5767 ℝcr 7612 0cc0 7613 1c1 7614 < clt 7793 ≤ cle 7794 # cap 8336 / cdiv 8425 ℤcz 9047 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-cnex 7704 ax-resscn 7705 ax-1cn 7706 ax-1re 7707 ax-icn 7708 ax-addcl 7709 ax-addrcl 7710 ax-mulcl 7711 ax-mulrcl 7712 ax-addcom 7713 ax-mulcom 7714 ax-addass 7715 ax-mulass 7716 ax-distr 7717 ax-i2m1 7718 ax-0lt1 7719 ax-1rid 7720 ax-0id 7721 ax-rnegex 7722 ax-precex 7723 ax-cnre 7724 ax-pre-ltirr 7725 ax-pre-ltwlin 7726 ax-pre-lttrn 7727 ax-pre-apti 7728 ax-pre-ltadd 7729 ax-pre-mulgt0 7730 ax-pre-mulext 7731 |
This theorem depends on definitions: df-bi 116 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-nel 2402 df-ral 2419 df-rex 2420 df-reu 2421 df-rmo 2422 df-rab 2423 df-v 2683 df-sbc 2905 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-br 3925 df-opab 3985 df-id 4210 df-po 4213 df-iso 4214 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-iota 5083 df-fun 5120 df-fv 5126 df-riota 5723 df-ov 5770 df-oprab 5771 df-mpo 5772 df-pnf 7795 df-mnf 7796 df-xr 7797 df-ltxr 7798 df-le 7799 df-sub 7928 df-neg 7929 df-reap 8330 df-ap 8337 df-div 8426 df-inn 8714 df-n0 8971 df-z 9048 |
This theorem is referenced by: halfnz 9140 facndiv 10478 |
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