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C7c : Psi function

S14ACF	$ψ (x) - \ln x$
S14ADF	Scaled derivatives of $ψ (x)$
S14AEF	Polygamma function $ψ^{(n)} (x)$ for real $x$
S14AFF	Polygamma function $ψ^{(n)} (z)$ for complex $z$

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© The Numerical Algorithms Group Ltd, Oxford UK. 2013