Re: Evaluating expression: help

*To*: mathgroup at smc.vnet.net*Subject*: [mg22204] Re: Evaluating expression: help*From*: Harald Giese <giese at ifm.uni-hamburg.de>*Date*: Fri, 18 Feb 2000 02:34:40 -0500 (EST)*Organization*: Institut fuer Meereskunde, Universitaet Hamburg*References*: <88g54e$4es@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Marco de Innocentis wrote: > > I need to evaluate expressions like the following > > Sum (from n = -5 to +5) q^(6*(n + 1/3)^2)*y^(12*(n + 1/3)) > > Is it possible to do this from Mathematica? If not, > which other programs can be used? Hi Marco, Mathematica can do that: In[]:= Sum[ q^(6*(n + 1/3)^2)*y^(12*(n + 1/3)), {n, -5, 5}] Out[]= q^(392/3)/y^56 + q^(242/3)/y^44 + q^(128/3)/y^32 + q^(50/3)/y^20 + q^(8/3)/y^8 + q^(2/3)*y^4 + q^(32/3)*y^16 + q^(98/3)*y^28 + q^(200/3)*y^40 + q^(338/3)*y^52 + q^(512/3)*y^64 Regards, /Harald