http://docs.sympy.org/latest/modules/functions/combinatorial.html#risingfactorial
I executed the examples in SymPy-Live but got different outputs from what the docs say. For example for >>> rf(x, k).rewrite(ff) gives nothing instead of: FallingFactorial(k + x - 1, k) >>> rf(x, k).rewrite(binomial) gives (x)^(k) instead of: binomial(k + x - 1, k)*factorial(k) >>> rf(n, k).rewrite(factorial) gives (n)^(k) instead of: factorial(k + n - 1)/factorial(n - 1) Also for rf(x**3, 2) the output is different, not Poly(x**6 + 3*x**5 + 3*x**4 + x**3, x, domain='ZZ') Peter -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/d806b47b-6d46-4f44-ab9d-234ead67a02f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
