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Concept

Riemann zeta function

The image depicts a circular diagram with radial lines and labeled points representing the Riemann zeta function's domain, including the real axis and key points in the complex plane.

The function defined for complex $s$ with real part greater than one by the sum $1 + 1/2^s + 1/3^s + \dots$, extended by analytic continuation to the rest of the plane. Euler had studied it for real $s$; Riemann's extension turned it into the central object of analytic number theory. Its zeros encode the distribution of the primes.

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