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23  * 		lgamma(1+s) = ieee_log(s) + ieee_lgamma(s)
25 * lgamma(7.3) = ieee_log(6.3) + ieee_lgamma(6.3)
28 * 2. Polynomial approximation of lgamma around its
32 * lgamma(x) = -1.214862905358496078218 + z^2*poly(z)
38 * lgamma(x) = 0.5*s + s*P(s)/Q(s)
51 * lgamma(x)~(x-0.5)log(x)-x+0.5*ieee_log(2pi)+1/(12x)-1/(360x**3)+....
68 * lgamma(x) = ieee_log(|Gamma(x)|)
74 * lgamma(2+s) ~ s*(1-Euler) for tiny s
75 * lgamma(1)=ieee_lgamma(2)=0
76 * lgamma(x) ~ -ieee_log(x) for tiny x
77 * lgamma(0) = ieee_lgamma(inf) = inf
78 * lgamma(-integer) = +-inf