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An asymptotic approximation of Wallis’ sequence

100%

Lampret V.

Open Mathematics

2012

tom 10

nr 2

775-787

An asymptotic approximation of Wallis’ sequence W(n) = Πk=1n 4k 2/(4k 2 − 1) obtained on the base of Stirling’s factorial formula is presented. As a consequence, several accurate new estimates of Wallis’ ratios w(n) = Πk=1n(2k−1)/(2k) are given. Also, an asymptotic approximation of π in terms of Wallis’ sequence W(n) is obtained, together with several double inequalities such as, for example, $W(n) \cdot (a_n + b_n ) < \pi < W(n) \cdot (a_n + b'_n )$ with $a_n = 2 + \frac{1} {{2n + 1}} + \frac{2} {{3(2n + 1)^2 }} - \frac{1} {{3n(2n + 1)'}}b_n = \frac{2} {{33(n + 1)^{2'} }}b'_n \frac{1} {{13n^{2'} }}n \in \mathbb{N} $ .

Approximating real Pochhammer products: a comparison with powers

84%

Lampret V.

Open Mathematics

2009

tom 7

nr 3

493-505

Accurate estimates of real Pochhammer products, lower (falling) and upper (rising), are presented. Double inequalities comparing the Pochhammer products with powers are given. Several examples showing how to use the established approximations are stated.

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2 Open Mathematics

2 Lampret V.

1 2012

1 2009

Wyniki wyszukiwania

An asymptotic approximation of Wallis’ sequence

Approximating real Pochhammer products: a comparison with powers