[GiNaC-devel] Bug fix G_do_hoelder

[Stefan Weinzierl]

Dear all,

attached is a small bug fix for the method G_do_hoelder in the file 
inifcns_nstsums.cpp

The method G_do_hoelder transforms the arguments as z --> 1-z.
If z has an imaginary part, the sign of the imagniary part transforms as
s --> -s.
In the special case where z is real and >1, the transformed value is real 
and <0. For (transformed) real negative values of z the sign of the 
imaginary part is 
not relevant (there are no branch cuts). The code requires that in this 
case the sign takes the default value +1. This is now fixed.

  Best wishes,

    Stefan
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