In this book, we are going to consider the elegant problems showing the relationships between the mathematical constants along with their solutions. The mathematical constants we are going to consider in this book include not only the well-known constants such as ln2, Pi, Napier's constant, Euler's constant, also various constants such as Riemann zeta function and Polylogarithm function coming out frequently in mathematical analysis.This book contains the open problems presented in several mathematical reference books and detailed solution of challenging problems, and also their new...