29 Numerics library [numerics]

29.9 Mathematical functions for floating-point types [c.math]

29.9.5 Mathematical special functions [sf.cmath]

29.9.5.18 Riemann zeta function [sf.cmath.riemann_zeta]

double riemann_zeta(double x); float riemann_zetaf(float x); long double riemann_zetal(long double x);
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Effects: These functions compute the Riemann zeta function of their respective arguments x.
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Returns:

where x is x.