http://sourceware.cygnus.com/gsl/ref/gsl-ref_12.html: > The Hurwicz zeta function is defined by zeta(s,q) = \sum_0^\infty (k+q)^(-s) That should be `Hurwitz'. Keith -- Keith Briggs, King's College Research Centre and Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA