Comment #17 on issue 3128 by [email protected]: Sum and Product
manipulations
http://code.google.com/p/sympy/issues/detail?id=3128
What does reverse order of limits mean?
Is it converting Sum(x, (x, 1, 10) --> Sum(x, (x, 10, 1))?
If so, would an interface like reverse_order(Sum, index1, index2, ...) be
good?
Which reorders the limits of variables related to index1, index2, ... and
so on.
By the way, when equating Sums and Products, shall we apply the
simplifications
proposed by this issue on them? Currently,
Sum(x, (x, 1, 3)) + Sum(x, (x, 4, 6)) == Sum(x, (x, 1, 6)) returns False.
But it should return True. We can simplify LHS and RHS of == before
returning the
value.
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