[Maxima] wrong symbolic sum
willisb at unk.edu
Sun Jul 26 12:08:59 CDT 2009
-----maxima-bounces at math.utexas.edu wrote: -----
>OK by me to restore sumhack.
Maple 10 defaults to sumhack behavior, I think:
sum(f(k),k=-9..-13) --> -f(-12) - f(-11) - f(-10)
Currently, we have consistency between things such as
(%i2) f(n) := block([acc : 0], for i : 0 thru n do acc : acc + i, acc)$
(%i4) g(n) := sum(i,i,0,n)$
I suppose that's good, but users should expect sums & loops to have
different properties. I might favor making sumhack : true the default.
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