friend numeric asinh(numeric const & x);
friend numeric acosh(numeric const & x);
friend numeric atanh(numeric const & x);
+ friend numeric bernoulli(numeric const & n);
friend numeric abs(numeric const & x);
friend numeric mod(numeric const & a, numeric const & b);
friend numeric smod(numeric const & a, numeric const & b);
numeric asinh(numeric const & x);
numeric acosh(numeric const & x);
numeric atanh(numeric const & x);
+numeric zeta(numeric const & x);
numeric gamma(numeric const & x);
+numeric psi(numeric const & n, numeric const & x);
numeric factorial(numeric const & n);
numeric doublefactorial(numeric const & n);
numeric binomial(numeric const & n, numeric const & k);
+numeric bernoulli(numeric const & n);
numeric abs(numeric const & x);
numeric mod(numeric const & a, numeric const & b);