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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 8919 | . . 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 9378 | . . . 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 8020 | . . . 4 ⊢ 1 ∈ ℝ | |
7 | 0lt1 8148 | . . . . . . . 8 ⊢ 0 < 1 | |
8 | 0re 8021 | . . . . . . . . 9 ⊢ 0 ∈ ℝ | |
9 | lttr 8095 | . . . . . . . . 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 8647 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 # 0) | |
14 | 12, 13 | syl 14 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 𝐴 # 0) |
15 | rerecclap 8751 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 # 0) → (1 / 𝐴) ∈ ℝ) | |
16 | 14, 15 | syldan 282 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) ∈ ℝ) |
17 | lenlt 8097 | . . . 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 2164 class class class wbr 4030 (class class class)co 5919 ℝcr 7873 0cc0 7874 1c1 7875 < clt 8056 ≤ cle 8057 # cap 8602 / cdiv 8693 ℤcz 9320 |
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 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4148 ax-pow 4204 ax-pr 4239 ax-un 4465 ax-setind 4570 ax-cnex 7965 ax-resscn 7966 ax-1cn 7967 ax-1re 7968 ax-icn 7969 ax-addcl 7970 ax-addrcl 7971 ax-mulcl 7972 ax-mulrcl 7973 ax-addcom 7974 ax-mulcom 7975 ax-addass 7976 ax-mulass 7977 ax-distr 7978 ax-i2m1 7979 ax-0lt1 7980 ax-1rid 7981 ax-0id 7982 ax-rnegex 7983 ax-precex 7984 ax-cnre 7985 ax-pre-ltirr 7986 ax-pre-ltwlin 7987 ax-pre-lttrn 7988 ax-pre-apti 7989 ax-pre-ltadd 7990 ax-pre-mulgt0 7991 ax-pre-mulext 7992 |
This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rmo 2480 df-rab 2481 df-v 2762 df-sbc 2987 df-dif 3156 df-un 3158 df-in 3160 df-ss 3167 df-pw 3604 df-sn 3625 df-pr 3626 df-op 3628 df-uni 3837 df-int 3872 df-br 4031 df-opab 4092 df-id 4325 df-po 4328 df-iso 4329 df-xp 4666 df-rel 4667 df-cnv 4668 df-co 4669 df-dm 4670 df-iota 5216 df-fun 5257 df-fv 5263 df-riota 5874 df-ov 5922 df-oprab 5923 df-mpo 5924 df-pnf 8058 df-mnf 8059 df-xr 8060 df-ltxr 8061 df-le 8062 df-sub 8194 df-neg 8195 df-reap 8596 df-ap 8603 df-div 8694 df-inn 8985 df-n0 9244 df-z 9321 |
This theorem is referenced by: halfnz 9416 facndiv 10813 dvdsprmpweqle 12478 |
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