Dilogarithm
A special case of the Polylogarithm 
for 
. It is denoted 
, or sometimes 
, and isdefined by the sum
or the integral
There are several remarkable identities involving the Polylogarithm function.See also Abel's Functional Equation, Polylogarithm, Spence's Integral
References
Abramowitz, M. and Stegun, C. A. (Eds.). ``Dilogarithm.'' §27.7 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, pp. 1004-1005, 1972.
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