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Summation in Mathematica

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  • Subject: [mg130590] Summation in Mathematica
  • From: Ben Blomberg <bblomberg at>
  • Date: Wed, 24 Apr 2013 07:03:54 -0400 (EDT)
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Hello All,

I am trying to understand a piece of code I found but I am stuck on this
summation. This is part of a larger do loop over n.

    UnderoverscriptBox[\(\[Sum]\), \(m = \(-10\)\),
\(10\)]\(\(eigenfunctionsort[n, j]\)[\([m + 11]\)]

What I mainly do not understand is  what is happening with the [m+11]. Is
that being multiplied with eigen function sort with each step in the sum,
or is that simply adding 11 to m at each step in the sum?

Thanks Ben

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