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Questions using the Sum command, especially for series and other algebraic objects, and related functions such as SumConvergence

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The following should be True for any function x: Sum[x[i], {i, 2, n - 1}] == Sum[x[j], {j, 2, n - 1}] Reduce and Simplify do not seem to recognize this. Is there an appropriate way to get Wolfram …
asked Sep 9 '16 by JJM