How do I invert a Sum() function?

Question:How do I invert a Sum() function?

Posted: paj006 0

November 03 2012

I'm trying to solve for n in a simple sum() function: Here is the function.

Which evaluates to
So, working in reverse, trying to solve

I choose 'solve for n'. The answer should be '2'. Plain and simple, just 2. Instead I get:

[[n = RootOf(2 Psi(_Z + 1) + 2 gamma - 3)]]

What's going on?

here is a screenshot

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