Step
*
of Lemma
cosine-approx-lemma
∀a:{2...}. ∀N:ℕ+. (∃k:ℕ [(N ≤ (a^((2 * k) + 2) * ((2 * k) + 2)!))])
BY
{ (Auto
THEN (Evaluate ⌜aa = (a * a) ∈ {4...}⌝⋅
THENA (Auto THEN (D 1 THENA Auto) THEN MemTypeCD THEN Auto THEN Mul ⌜a⌝ 2⋅ THEN Auto)
)
THEN (RWO "exp2<" (-1) THENA Auto)) }
1
1. a : {2...}
2. N : ℕ+
3. aa : {4...}
4. aa = a^2 ∈ {4...}
⊢ ∃k:ℕ [(N ≤ (a^((2 * k) + 2) * ((2 * k) + 2)!))]
Latex:
Latex:
\mforall{}a:\{2...\}. \mforall{}N:\mBbbN{}\msupplus{}. (\mexists{}k:\mBbbN{} [(N \mleq{} (a\^{}((2 * k) + 2) * ((2 * k) + 2)!))])
By
Latex:
(Auto
THEN (Evaluate \mkleeneopen{}aa = (a * a)\mkleeneclose{}\mcdot{}
THENA (Auto THEN (D 1 THENA Auto) THEN MemTypeCD THEN Auto THEN Mul \mkleeneopen{}a\mkleeneclose{} 2\mcdot{} THEN Auto)
)
THEN (RWO "exp2<" (-1) THENA Auto))
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