I managed to create the symbolic polygamma function as psi(order,x).
Psi is limited in what it can do, though. I can get it to grab
special values from Maxima's or GiNaC's table, but I still cannot get
it to approximate any value of any integer order. It can be
differentiated, but not integrated. It seems that this is a
limitation of Maxima and GiNaC, not Sage.
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