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2 Kawalec A.

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The inverse Riemann zeta function

Kawalec A.

Computational Methods in Science and Technology

2021

Vol. 27, No. 2

57--91

In this article, we develop a formula for an inverse Riemann zeta function such that for w = ζ(s) we have s = ζ −1 (w) for real and complex domains s and w. The presented work is based on extending the analytical recurrence formulas for trivial and non-trivial zeros to solve an equation ζ(s) − w = 0 for a given w-domain using logarithmic differentiation and zeta recursive root extraction methods. We further explore formulas for trivial and non-trivial zeros of the Riemann zeta function in greater detail, and next, we introduce an expansion of the inverse zeta function by its singularities, study its properties and develop many identities that emerge from them. In the last part we extend the presented results as a general method for finding zeros and inverses of many other functions, such as the gamma function, the Bessel function of the first kind, or finite/infinite degree polynomials and rational functions, etc. We further compute all the presented formulas numerically to high precision and show that these formulas do indeed converge to the inverse of the Riemann zeta function and the related results. We also develop a fast algorithm to compute ζ −1 (w) for complex w.

On the complex magnitude of Dirichlet beta function

Kawalec A.

Computational Methods in Science and Technology

2020

Vol. 26, No. 1

21--28

In this article, we derive an expression for the complex magnitude of the Dirichlet beta function β(s) represented as a Euler prime product and compare with similar results for the Riemann zeta function. We also obtain formulas for β(s) valid for an even and odd kth positive integer argument and present a set of generated formulas for β(k) up to 11th order, including Catalan’s constant and compute these formulas numerically. Additionally, we derive a second expression for the complex magnitude of β(s) valid in the critical strip from which we obtain a formula for the Euler-Mascheroni constant expressed in terms of zeros of the Dirichlet beta function on the critical line. Finally, we investigate the asymptotic behavior of the Euler prime product on the critical line.