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: integral : http://dlmf.nist.gov/1.4#iv
: -Pochhammer symbol : http://dlmf.nist.gov/5.18#i http://dlmf.nist.gov/17.2#SS1.p1
: the base of the natural logarithm : http://dlmf.nist.gov/4.2.E11
Equation in Section 1.15 of KLS.
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