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Solve equation with summation?

  • To: mathgroup at
  • Subject: [mg122945] Solve equation with summation?
  • From: Ivan <iveney at>
  • Date: Fri, 18 Nov 2011 06:21:48 -0500 (EST)
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For a summation like \sum_{i=1}^n a_i/x = 1,

  Solve[Sum[Subscript[a, i], {i, 1, n}]/x == 1, x]

gives a correct solution.

However, by putting x into the summation:

  Solve[Sum[Subscript[a, i]/x, {i, 1, n}] == 1, x]

gives an empty set, why?

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