Logarithmic integrals with applications to BBP and Euler-type sums

TL;DR

This paper evaluates a family of logarithmic integrals involving parameters and applies the results to derive new Euler-BBP-type sums, extending known integrals and providing explicit formulas for specific parameter values.

Contribution

The paper explicitly evaluates a class of logarithmic integrals for specific parameters and uses these results to derive new Euler-BBP-type sums.

Findings

Explicit formulas for integrals with parameters p,q,m.

Recovery of some previously known integrals.

Derivation of new Euler-BBP-type sums.

Abstract

For real numbers $p,q>1$ we consider the following family of integrals: \begin{equation*} \int_{0}^{1}\frac{(x^{q-2}+1)\log\left(x^{mq}+1\right)}{x^q+1}{\rm d}x \quad \mbox{and}\quad \int_{0}^{1}\frac{(x^{pt-2}+1)\log\left(x^t+1\right)}{x^{pt}+1}{\rm d}x. \end{equation*} We evaluate these integrals for all $m\in\mathbb{N}$, $q=2,3,4$ and $p=2,3$ explicitly. They recover some previously known integrals. We also compute many integrals over the infinite interval $[0,\infty)$. Applying these results we offer many new Euler- BBP- type sums.