irrapxlem3 - Mathbox for Stefan O'Rear

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Theorem irrapxlem3 42819

Description: Lemma for irrapx1 42823. By subtraction, there is a multiple very close to an integer. (Contributed by Stefan O'Rear, 13-Sep-2014.)

**Assertion**
Ref	Expression
irrapxlem3	⊢ ((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵))

Distinct variable groups: 𝑥,𝐴,𝑦 𝑥,𝐵,𝑦

Proof of Theorem irrapxlem3 Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		irrapxlem2 42818	. 2 ⊢ ((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) → ∃𝑎 ∈ (0...𝐵)∃𝑏 ∈ (0...𝐵)(𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵)))
2		1z 12570	. . . . . . . 8 ⊢ 1 ∈ ℤ
3	2	a1i 11	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 1 ∈ ℤ)
4		simpllr 775	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝐵 ∈ ℕ)
5	4	nnzd 12563	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝐵 ∈ ℤ)
6		simplrr 777	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑏 ∈ (0...𝐵))
7	6	elfzelzd 13493	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑏 ∈ ℤ)
8		simplrl 776	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 ∈ (0...𝐵))
9	8	elfzelzd 13493	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 ∈ ℤ)
10	7, 9	zsubcld 12650	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 𝑎) ∈ ℤ)
11		1m1e0 12265	. . . . . . . . 9 ⊢ (1 − 1) = 0
12		elfzelz 13492	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ (0...𝐵) → 𝑎 ∈ ℤ)
13	12	ad2antrl 728	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → 𝑎 ∈ ℤ)
14	13	zred 12645	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → 𝑎 ∈ ℝ)
15		elfzelz 13492	. . . . . . . . . . . . 13 ⊢ (𝑏 ∈ (0...𝐵) → 𝑏 ∈ ℤ)
16	15	ad2antll 729	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → 𝑏 ∈ ℤ)
17	16	zred 12645	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → 𝑏 ∈ ℝ)
18	14, 17	posdifd 11772	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → (𝑎 < 𝑏 ↔ 0 < (𝑏 − 𝑎)))
19	18	biimpa 476	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 0 < (𝑏 − 𝑎))
20	11, 19	eqbrtrid 5145	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (1 − 1) < (𝑏 − 𝑎))
21		zlem1lt 12592	. . . . . . . . 9 ⊢ ((1 ∈ ℤ ∧ (𝑏 − 𝑎) ∈ ℤ) → (1 ≤ (𝑏 − 𝑎) ↔ (1 − 1) < (𝑏 − 𝑎)))
22	2, 10, 21	sylancr 587	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (1 ≤ (𝑏 − 𝑎) ↔ (1 − 1) < (𝑏 − 𝑎)))
23	20, 22	mpbird 257	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 1 ≤ (𝑏 − 𝑎))
24	7	zred 12645	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑏 ∈ ℝ)
25	9	zred 12645	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 ∈ ℝ)
26	24, 25	resubcld 11613	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 𝑎) ∈ ℝ)
27		0red 11184	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 0 ∈ ℝ)
28	24, 27	resubcld 11613	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 0) ∈ ℝ)
29	4	nnred 12208	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝐵 ∈ ℝ)
30		elfzle1 13495	. . . . . . . . . 10 ⊢ (𝑎 ∈ (0...𝐵) → 0 ≤ 𝑎)
31	8, 30	syl 17	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 0 ≤ 𝑎)
32	27, 25, 24, 31	lesub2dd 11802	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 𝑎) ≤ (𝑏 − 0))
33	24	recnd 11209	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑏 ∈ ℂ)
34	33	subid1d 11529	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 0) = 𝑏)
35		elfzle2 13496	. . . . . . . . . 10 ⊢ (𝑏 ∈ (0...𝐵) → 𝑏 ≤ 𝐵)
36	6, 35	syl 17	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑏 ≤ 𝐵)
37	34, 36	eqbrtrd 5132	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 0) ≤ 𝐵)
38	26, 28, 29, 32, 37	letrd 11338	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 𝑎) ≤ 𝐵)
39	3, 5, 10, 23, 38	elfzd 13483	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑏 − 𝑎) ∈ (1...𝐵))
40	39	adantrr 717	. . . . 5 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ (𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵))) → (𝑏 − 𝑎) ∈ (1...𝐵))
41		rpre 12967	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℝ⁺ → 𝐴 ∈ ℝ)
42	41	ad3antrrr 730	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝐴 ∈ ℝ)
43	42, 25	remulcld 11211	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · 𝑎) ∈ ℝ)
44	42, 24	remulcld 11211	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · 𝑏) ∈ ℝ)
45		simpr 484	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 < 𝑏)
46	25, 24, 45	ltled 11329	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 ≤ 𝑏)
47		rpgt0 12971	. . . . . . . . . . 11 ⊢ (𝐴 ∈ ℝ⁺ → 0 < 𝐴)
48	47	ad3antrrr 730	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 0 < 𝐴)
49		lemul2 12042	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝑎 ≤ 𝑏 ↔ (𝐴 · 𝑎) ≤ (𝐴 · 𝑏)))
50	25, 24, 42, 48, 49	syl112anc 1376	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝑎 ≤ 𝑏 ↔ (𝐴 · 𝑎) ≤ (𝐴 · 𝑏)))
51	46, 50	mpbid 232	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · 𝑎) ≤ (𝐴 · 𝑏))
52		flword2 13782	. . . . . . . 8 ⊢ (((𝐴 · 𝑎) ∈ ℝ ∧ (𝐴 · 𝑏) ∈ ℝ ∧ (𝐴 · 𝑎) ≤ (𝐴 · 𝑏)) → (⌊‘(𝐴 · 𝑏)) ∈ (ℤ_≥‘(⌊‘(𝐴 · 𝑎))))
53	43, 44, 51, 52	syl3anc 1373	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (⌊‘(𝐴 · 𝑏)) ∈ (ℤ_≥‘(⌊‘(𝐴 · 𝑎))))
54		uznn0sub 12839	. . . . . . 7 ⊢ ((⌊‘(𝐴 · 𝑏)) ∈ (ℤ_≥‘(⌊‘(𝐴 · 𝑎))) → ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) ∈ ℕ₀)
55	53, 54	syl 17	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) ∈ ℕ₀)
56	55	adantrr 717	. . . . 5 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ (𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵))) → ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) ∈ ℕ₀)
57	42	recnd 11209	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝐴 ∈ ℂ)
58	25	recnd 11209	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 𝑎 ∈ ℂ)
59	57, 33, 58	subdid 11641	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · (𝑏 − 𝑎)) = ((𝐴 · 𝑏) − (𝐴 · 𝑎)))
60	59	oveq1d 7405	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎)))) = (((𝐴 · 𝑏) − (𝐴 · 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎)))))
61	44	recnd 11209	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · 𝑏) ∈ ℂ)
62	43	recnd 11209	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (𝐴 · 𝑎) ∈ ℂ)
63	44	flcld 13767	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (⌊‘(𝐴 · 𝑏)) ∈ ℤ)
64	63	zcnd 12646	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (⌊‘(𝐴 · 𝑏)) ∈ ℂ)
65	43	flcld 13767	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (⌊‘(𝐴 · 𝑎)) ∈ ℤ)
66	65	zcnd 12646	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (⌊‘(𝐴 · 𝑎)) ∈ ℂ)
67	61, 62, 64, 66	sub4d 11589	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (((𝐴 · 𝑏) − (𝐴 · 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎)))) = (((𝐴 · 𝑏) − (⌊‘(𝐴 · 𝑏))) − ((𝐴 · 𝑎) − (⌊‘(𝐴 · 𝑎)))))
68		modfrac 13853	. . . . . . . . . . . . . 14 ⊢ ((𝐴 · 𝑏) ∈ ℝ → ((𝐴 · 𝑏) mod 1) = ((𝐴 · 𝑏) − (⌊‘(𝐴 · 𝑏))))
69	44, 68	syl 17	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑏) mod 1) = ((𝐴 · 𝑏) − (⌊‘(𝐴 · 𝑏))))
70	69	eqcomd 2736	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑏) − (⌊‘(𝐴 · 𝑏))) = ((𝐴 · 𝑏) mod 1))
71		modfrac 13853	. . . . . . . . . . . . . 14 ⊢ ((𝐴 · 𝑎) ∈ ℝ → ((𝐴 · 𝑎) mod 1) = ((𝐴 · 𝑎) − (⌊‘(𝐴 · 𝑎))))
72	43, 71	syl 17	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑎) mod 1) = ((𝐴 · 𝑎) − (⌊‘(𝐴 · 𝑎))))
73	72	eqcomd 2736	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑎) − (⌊‘(𝐴 · 𝑎))) = ((𝐴 · 𝑎) mod 1))
74	70, 73	oveq12d 7408	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (((𝐴 · 𝑏) − (⌊‘(𝐴 · 𝑏))) − ((𝐴 · 𝑎) − (⌊‘(𝐴 · 𝑎)))) = (((𝐴 · 𝑏) mod 1) − ((𝐴 · 𝑎) mod 1)))
75	60, 67, 74	3eqtrd 2769	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎)))) = (((𝐴 · 𝑏) mod 1) − ((𝐴 · 𝑎) mod 1)))
76	75	fveq2d 6865	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) = (abs‘(((𝐴 · 𝑏) mod 1) − ((𝐴 · 𝑎) mod 1))))
77		1rp 12962	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ⁺
78	77	a1i 11	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → 1 ∈ ℝ⁺)
79	44, 78	modcld 13844	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑏) mod 1) ∈ ℝ)
80	79	recnd 11209	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑏) mod 1) ∈ ℂ)
81	43, 78	modcld 13844	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑎) mod 1) ∈ ℝ)
82	81	recnd 11209	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((𝐴 · 𝑎) mod 1) ∈ ℂ)
83	80, 82	abssubd 15429	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (abs‘(((𝐴 · 𝑏) mod 1) − ((𝐴 · 𝑎) mod 1))) = (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))))
84	76, 83	eqtr2d 2766	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) = (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))))
85	84	breq1d 5120	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵) ↔ (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) < (1 / 𝐵)))
86	85	biimpd 229	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ 𝑎 < 𝑏) → ((abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵) → (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) < (1 / 𝐵)))
87	86	impr 454	. . . . 5 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ (𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵))) → (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) < (1 / 𝐵))
88		oveq2 7398	. . . . . . . 8 ⊢ (𝑥 = (𝑏 − 𝑎) → (𝐴 · 𝑥) = (𝐴 · (𝑏 − 𝑎)))
89	88	fvoveq1d 7412	. . . . . . 7 ⊢ (𝑥 = (𝑏 − 𝑎) → (abs‘((𝐴 · 𝑥) − 𝑦)) = (abs‘((𝐴 · (𝑏 − 𝑎)) − 𝑦)))
90	89	breq1d 5120	. . . . . 6 ⊢ (𝑥 = (𝑏 − 𝑎) → ((abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵) ↔ (abs‘((𝐴 · (𝑏 − 𝑎)) − 𝑦)) < (1 / 𝐵)))
91		oveq2 7398	. . . . . . . 8 ⊢ (𝑦 = ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) → ((𝐴 · (𝑏 − 𝑎)) − 𝑦) = ((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎)))))
92	91	fveq2d 6865	. . . . . . 7 ⊢ (𝑦 = ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) → (abs‘((𝐴 · (𝑏 − 𝑎)) − 𝑦)) = (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))))
93	92	breq1d 5120	. . . . . 6 ⊢ (𝑦 = ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) → ((abs‘((𝐴 · (𝑏 − 𝑎)) − 𝑦)) < (1 / 𝐵) ↔ (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) < (1 / 𝐵)))
94	90, 93	rspc2ev 3604	. . . . 5 ⊢ (((𝑏 − 𝑎) ∈ (1...𝐵) ∧ ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))) ∈ ℕ₀ ∧ (abs‘((𝐴 · (𝑏 − 𝑎)) − ((⌊‘(𝐴 · 𝑏)) − (⌊‘(𝐴 · 𝑎))))) < (1 / 𝐵)) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵))
95	40, 56, 87, 94	syl3anc 1373	. . . 4 ⊢ ((((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) ∧ (𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵))) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵))
96	95	ex 412	. . 3 ⊢ (((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) ∧ (𝑎 ∈ (0...𝐵) ∧ 𝑏 ∈ (0...𝐵))) → ((𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵)) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵)))
97	96	rexlimdvva 3195	. 2 ⊢ ((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) → (∃𝑎 ∈ (0...𝐵)∃𝑏 ∈ (0...𝐵)(𝑎 < 𝑏 ∧ (abs‘(((𝐴 · 𝑎) mod 1) − ((𝐴 · 𝑏) mod 1))) < (1 / 𝐵)) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵)))
98	1, 97	mpd 15	1 ⊢ ((𝐴 ∈ ℝ⁺ ∧ 𝐵 ∈ ℕ) → ∃𝑥 ∈ (1...𝐵)∃𝑦 ∈ ℕ₀ (abs‘((𝐴 · 𝑥) − 𝑦)) < (1 / 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∃wrex 3054 class class class wbr 5110 ‘cfv 6514 (class class class)co 7390 ℝcr 11074 0cc0 11075 1c1 11076 · cmul 11080 < clt 11215 ≤ cle 11216 − cmin 11412 / cdiv 11842 ℕcn 12193 ℕ₀cn0 12449 ℤcz 12536 ℤ_≥cuz 12800 ℝ⁺crp 12958 ...cfz 13475 ⌊cfl 13759 mod cmo 13838 abscabs 15207

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 ax-cnex 11131 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 ax-pre-mulgt0 11152 ax-pre-sup 11153

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-nel 3031 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-int 4914 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7846 df-1st 7971 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-rdg 8381 df-1o 8437 df-oadd 8441 df-er 8674 df-en 8922 df-dom 8923 df-sdom 8924 df-fin 8925 df-sup 9400 df-inf 9401 df-card 9899 df-pnf 11217 df-mnf 11218 df-xr 11219 df-ltxr 11220 df-le 11221 df-sub 11414 df-neg 11415 df-div 11843 df-nn 12194 df-2 12256 df-3 12257 df-n0 12450 df-xnn0 12523 df-z 12537 df-uz 12801 df-rp 12959 df-ico 13319 df-fz 13476 df-fl 13761 df-mod 13839 df-seq 13974 df-exp 14034 df-hash 14303 df-cj 15072 df-re 15073 df-im 15074 df-sqrt 15208 df-abs 15209

This theorem is referenced by: irrapxlem4 42820

W3C validator