Step
*
1
2
1
1
1
of Lemma
dd_wf
.....set predicate.....
1. d : ℕ+
2. x : ℝ
3. N : ℕ+
4. 10^d = N ∈ ℕ+
5. N = (2 * (N ÷ 2)) ∈ ℤ
6. N2 : ℕ+
7. (N ÷ 2) = N2 ∈ ℕ+
8. D : ℤ
9. (x N2) = D ∈ ℤ
10. |x - (r(D)/r(N))| ≤ (r1/r(N2))
11. N = (2 * N2) ∈ ℤ
⊢ |x - (r(D)/r(N))| ≤ (r(2)/r(N))
BY
{ TACTIC:(RWO "-2" 0 THEN Auto) }
Latex:
Latex:
.....set predicate.....
1. d : \mBbbN{}\msupplus{}
2. x : \mBbbR{}
3. N : \mBbbN{}\msupplus{}
4. 10\^{}d = N
5. N = (2 * (N \mdiv{} 2))
6. N2 : \mBbbN{}\msupplus{}
7. (N \mdiv{} 2) = N2
8. D : \mBbbZ{}
9. (x N2) = D
10. |x - (r(D)/r(N))| \mleq{} (r1/r(N2))
11. N = (2 * N2)
\mvdash{} |x - (r(D)/r(N))| \mleq{} (r(2)/r(N))
By
Latex:
TACTIC:(RWO "-2" 0 THEN Auto)
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