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Integral and Series Representations of Riemann's Zeta Function and Dirichlet's Eta Function and a Medley of Related Results [PDF]

open access: yesJournal of Mathematics, 2013
Contour integral representations of Riemann's Zeta function and Dirichlet's Eta (alternating Zeta) function are presented and investigated. These representations flow naturally from methods developed in the 1800s, but somehow they do not appear in the ...
Michael S. Milgram
doaj   +4 more sources

Mellin Transform of Logarithm and Quotient Function with Reducible Quartic Polynomial in Terms of the Lerch Function

open access: yesAxioms, 2021
A class of definite integrals involving a quotient function with a reducible polynomial, logarithm and nested logarithm functions are derived with a possible connection to contact problems for a wedge.
Robert Reynolds, Allan Stauffer
doaj   +1 more source

Infinite Sum of the Incomplete Gamma Function Expressed in Terms of the Hurwitz Zeta Function

open access: yesMathematics, 2021
We apply our simultaneous contour integral method to an infinite sum in Prudnikov et al. and use it to derive the infinite sum of the Incomplete gamma function in terms of the Hurwitz zeta function.
Robert Reynolds, Allan Stauffer
doaj   +1 more source

Determination of scattering frequencies for two-dimensional acoustic problems using boundary element method

open access: yesJournal of Low Frequency Noise, Vibration and Active Control, 2021
This paper presents a numerical approach for the determination of scattering frequencies of two-dimensional acoustic exterior resonance problems using boundary element method combined with a contour integral method.
Haifeng Gao   +4 more
doaj   +1 more source

The Logarithmic Transform of a Polynomial Function Expressed in Terms of the Lerch Function

open access: yesMathematics, 2021
This is a collection of definite integrals involving the logarithmic and polynomial functions in terms of special functions and fundamental constants. All the results in this work are new.
Robert Reynolds, Allan Stauffer
doaj   +1 more source

Table in Gradshteyn and Ryzhik: Derivation of Definite Integrals of a Hyperbolic Function

open access: yesSci, 2021
We present a method using contour integration to derive definite integrals and their associated infinite sums which can be expressed as a special function. We give a proof of the basic equation and some examples of the method.
Robert Reynolds, Allan Stauffer
doaj   +1 more source

Definite Integral Involving Rational Functions of Powers and Exponentials Expressed in Terms of the Lerch Function

open access: yesMathematical and Computational Applications, 2021
This paper gives new integrals related to a class of special functions. This paper also showcases the derivation of definite integrals involving the quotient of functions with powers and the exponential function expressed in terms of the Lerch function ...
Robert Reynolds, Allan Stauffer
doaj   +1 more source

Targeting multi-loop integrals with neural networks

open access: yesSciPost Physics, 2022
Numerical evaluations of Feynman integrals often proceed via a deformation of the integration contour into the complex plane. While valid contours are easy to construct, the numerical precision for a multi-loop integral can depend critically on the ...
Ramon Winterhalder, Vitaly Magerya, Emilio Villa, Stephen P. Jones, Matthias Kerner, Anja Butter, Gudrun Heinrich, Tilman Plehn
doaj   +1 more source

A convenient Keldysh contour for thermodynamically consistent perturbative and semiclassical expansions

open access: yesSciPost Physics, 2023
The work fluctuation theorem (FT) is a symmetry connecting the moment generating functions (MGFs) of the work extracted in a given process and in its time-reversed counterpart.
Vasco Cavina, Sadeq S. Kadijani, Massimiliano Esposito, Thomas L. Schmidt
doaj   +1 more source

Backpropagating Hybrid Monte Carlo algorithm for fast Lefschetz thimble calculations

open access: yesJournal of High Energy Physics, 2022
The Picard-Lefschetz theory has been attracting much attention as a tool to evaluate a multi-variable integral with a complex weight, which appears in various important problems in theoretical physics.
Genki Fujisawa   +3 more
doaj   +1 more source

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