Comment #30 on issue 683 by [email protected]: speedup of sum(x**i/i,i=1..400)
http://code.google.com/p/sympy/issues/detail?id=683
hash sorting is used in Add, now, but there is still a significant difference in the following:
t=time();jnk=Add(*[u**i/i for i in range(1,1001)]);print time()-t
0.359377145767
t=time();jnk=sum([v**i/i for i in range(1,1001)]);print time()-t
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