WE_1 WEi WEn WLi WSpence

WSpence() Function WSpence ( X As  Double ) Spence's function (dilogarithm) Li2(x) Purpose WSpence computes a Spence's function (dilogarithm). Li2(x) = ∫ -ln(1-t)/t dt [0, x] For abs(x) < 1, the following uniformly convergent expansion is valid. Li2(x) = Σ x^k/k^2 (k = 1 to ∞) Returns Spence's function Li2(x). Parameters [in] X Argument x.