Comment #4 on issue 3703 by [email protected]: Sum of a finite power
series performs automatic reduction which is not always valid
http://code.google.com/p/sympy/issues/detail?id=3703
I'm sorry, I pasted the wrong summation up there. It was late and I think
my brain blew a fuse due to lack of sleep. So much for "ooh I'll do the
responsible thing and submit a bug report"... :\
Anyway, I meant to paste:
mysum = summation( x**n ,(n,1,M) )
Basically what I mean is that 1+x+x^2+....+x^M seems to auto-reduce to
(1-x^(M+1))/(1-x), which is not true when x=1. Please let me know whether
you can actually reproduce this or it was a product of my sleep-deprived
imagination.
Apologies again
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