# A Class of Series Acceleration Formulae for Catalan's Constant

Bradley, David M. (1997) A Class of Series Acceleration Formulae for Catalan's Constant. [Preprint]

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In this note, we develop transformation formulae and expansions for the log tangent integral, which are then used to derive series acceleration formulae for certain values of Dirichlet $L$-functions, such as Catalan's constant. The formulae are characterized by the presence of an infinite series whose general term consists of a linear recurrence damped by the central binomial coefficient and a certain quadratic polynomial. Typically, the series can be expressed in closed form as a rational linear combination of Catalan's constant and $\pi$ times the logarithm of an algebraic unit.