let summary = [{
Compute the polygamma function \\(\psi^{(n)}(x)\\).
  }];

  let description = [{
The polygamma function is defined as:


\\(\psi^{(a)}(x) = \frac{d^a}{dx^a} \psi(x)\\)

where \\(\psi(x)\\) is the digamma function.
The polygamma function is defined only for non-negative integer orders \\a\\.
  }];

  let arguments = (ins

205F          ; disallowed_STD3_mapped ; 0020          # 3.2  MEDIUM MATHEMATICAL SPACE
2060          ; ignored                                # 3.2  WORD JOINER
2061..2063    ; disallowed                             # 3.2  FUNCTION APPLICATION..INVISIBLE SEPARATOR
2064          ; ignored                                # 5.1  INVISIBLE PLUS
2065          ; disallowed                             # NA   <reserved-2065>