Comment #11 on issue 1727 by asmeurer: fix namespace clashes http://code.google.com/p/sympy/issues/detail?id=1727
summate() sounds awkward to me. ssum I do not like at all. I would rather use a complete word when we can. summation() to me is even better than sum() in some ways, because you know for certain that it is symbolic summation and not just adding the elements of a list, like sum(). Often when I use a CAS for the first time I am uncertain which one of these the sum() function does.
summation() is also in line with product() (we don't have productate, productize, multiply, …). I think it's more important to use a word that is familiar to people than to have verb-noun parity. After all, the case of the first character of the function indicates whether it is evaluated or not, and so does the docstring.
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