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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 8944 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (0 < (1 / 𝐴) ∧ (1 / 𝐴) < 1)) | |
| 2 | 1 | simprd 114 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) < 1) |
| 3 | 1 | simpld 112 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 0 < (1 / 𝐴)) |
| 4 | zgt0ge1 9403 | . . . 4 ⊢ ((1 / 𝐴) ∈ ℤ → (0 < (1 / 𝐴) ↔ 1 ≤ (1 / 𝐴))) | |
| 5 | 3, 4 | syl5ibcom 155 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ((1 / 𝐴) ∈ ℤ → 1 ≤ (1 / 𝐴))) |
| 6 | 1re 8044 | . . . 4 ⊢ 1 ∈ ℝ | |
| 7 | 0lt1 8172 | . . . . . . . 8 ⊢ 0 < 1 | |
| 8 | 0re 8045 | . . . . . . . . 9 ⊢ 0 ∈ ℝ | |
| 9 | lttr 8119 | . . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) | |
| 10 | 8, 6, 9 | mp3an12 1338 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) |
| 11 | 7, 10 | mpani 430 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (1 < 𝐴 → 0 < 𝐴)) |
| 12 | 11 | imdistani 445 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (𝐴 ∈ ℝ ∧ 0 < 𝐴)) |
| 13 | gt0ap0 8672 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 # 0) | |
| 14 | 12, 13 | syl 14 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 𝐴 # 0) |
| 15 | rerecclap 8776 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (1 / 𝐴) ∈ ℝ) | |
| 16 | 14, 15 | syldan 282 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) ∈ ℝ) |
| 17 | lenlt 8121 | . . . 4 ⊢ ((1 ∈ ℝ ∧ (1 / 𝐴) ∈ ℝ) → (1 ≤ (1 / 𝐴) ↔ ¬ (1 / 𝐴) < 1)) | |
| 18 | 6, 16, 17 | sylancr 414 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 ≤ (1 / 𝐴) ↔ ¬ (1 / 𝐴) < 1)) |
| 19 | 5, 18 | sylibd 149 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ((1 / 𝐴) ∈ ℤ → ¬ (1 / 𝐴) < 1)) |
| 20 | 2, 19 | mt2d 626 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → ¬ (1 / 𝐴) ∈ ℤ) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2167 class class class wbr 4034 (class class class)co 5925 ℝcr 7897 0cc0 7898 1c1 7899 < clt 8080 ≤ cle 8081 # cap 8627 / cdiv 8718 ℤcz 9345 |
| 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 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-cnex 7989 ax-resscn 7990 ax-1cn 7991 ax-1re 7992 ax-icn 7993 ax-addcl 7994 ax-addrcl 7995 ax-mulcl 7996 ax-mulrcl 7997 ax-addcom 7998 ax-mulcom 7999 ax-addass 8000 ax-mulass 8001 ax-distr 8002 ax-i2m1 8003 ax-0lt1 8004 ax-1rid 8005 ax-0id 8006 ax-rnegex 8007 ax-precex 8008 ax-cnre 8009 ax-pre-ltirr 8010 ax-pre-ltwlin 8011 ax-pre-lttrn 8012 ax-pre-apti 8013 ax-pre-ltadd 8014 ax-pre-mulgt0 8015 ax-pre-mulext 8016 |
| This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rmo 2483 df-rab 2484 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-int 3876 df-br 4035 df-opab 4096 df-id 4329 df-po 4332 df-iso 4333 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-iota 5220 df-fun 5261 df-fv 5267 df-riota 5880 df-ov 5928 df-oprab 5929 df-mpo 5930 df-pnf 8082 df-mnf 8083 df-xr 8084 df-ltxr 8085 df-le 8086 df-sub 8218 df-neg 8219 df-reap 8621 df-ap 8628 df-div 8719 df-inn 9010 df-n0 9269 df-z 9346 |
| This theorem is referenced by: halfnz 9441 facndiv 10850 dvdsprmpweqle 12533 |
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