Comment #5 on issue 2316 by [email protected]: limit involving multi-arg
function (polygamma) fails
http://code.google.com/p/sympy/issues/detail?id=2316
I'm wondering what is involved in fixing this. I got a similar error
("NotImplementedError: MRV set ...") when trying to evaluate
num = binomial(2*n,n)/(n+1)
denom = 4**n/sqrt(pi*n**3)
limit(num/denom, n, oo)
<NotImplementedError>
If I tell sympy to use the factorial definition of the binomial
coefficient, I get the right answer:
num = factorial(2*n)/factorial(n)**2/(n+1)
denom = 4**n/sqrt(pi*n**3)
limit(num/denom, n, oo)
1
What's slightly special about this case is that the error relating to
several variables does not really apply. Since I am evaluating a quantity
that, while defined in terms of a binomial coefficient, is really a
univariate expression. So my questions are twofold:
1. what is involved in getting full multivariate support?
2. if that is too difficult, is it worth attempting to simplify expressions
that are actually univariate? I believe that .free_symbols would work here)
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