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Questions about internal, possibly undocumented functions and/or the construction, implementation or design of Mathematica

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For a generic symbol A[i] 2 Sum[A[i], {i, 1, n}] == Sum[2 A[i], {i, 1, n}] does not return True. Is there any reason behind these behaviors? Do we have any way to evaluate the equation correctly? …
asked May 31 by hfukuda