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MathGroup Archive 2000

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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


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