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+From Karim Belabas 9 Jan 2014:
+Implement Hurwitz(s,x) -> gives Zeta for x=1.
+Cf http://arxiv.org/abs/1309.2877
+
 From Andreas Enge 27 August 2012:
 Implement im(atan(x+i*y)) as
 1/4 * [log1p (4y / (x^2 +(1-y)^2))]