FeynCalc manual (development version)

FCClausen

FCClausen[x,y] gives the Clausen function with arguments x and y.

See also

Overview

Examples

FCClausen[2, x]

\text{Cl}_2(x)

FCClausen[2, x] // Explicit

\frac{1}{2} i \left(\text{Li}_2\left(e^{-i x}\right)-\text{Li}_2\left(e^{i x}\right)\right)

FCClausen[2, 1.3]

\text{Cl}_2(1.3)

FCClausen[2, 1.3] // N

0.989703\, +0. i

FCClausen[2, Pi/2, Explicit -> True]

C

FCClausen[2, Pi/2, Explicit -> True] // StandardForm

(*Catalan*)