Updates:
Cc: [email protected]
Labels: Simplify
Comment #1 on issue 2908 by [email protected]: simplification of polygamma
needed
http://code.google.com/p/sympy/issues/detail?id=2908
When you get hypergeometric functions, one way to canonicalize them is to
use hyperexpand (or expand(func=True), which does the same thing):
In [17]: hyperexpand(a - b)
Out[17]: -(x + 1)⋅Γ(x + 1)⋅polygamma(0, x + 1) - x! + Γ(x + 2)⋅polygamma(0,
x + 2)
In [18]: (a - b).expand(func=True)
Out[18]:
2
x ⋅Γ(x) x⋅Γ(x)
─────── + ────── - x!
x + 1 x + 1
In [19]: simplify((a - b).expand(func=True))
Out[19]: 0
This perhaps should be integrated into combsimp(), or at least simplify(),
somehow (?)
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