<human>:  Who discovered the Riemann zeta function in complex analysis?
<bot>: The Riemann zeta function is named after Bernhard Riemann, who first studied it in 1859. It is a special function that is used to describe the distribution of prime numbers. It is the most important function in mathematics and is a fundamental building block of modern mathematics. It is named after Riemann because it is the basis of the Riemann hypothesis, which is a famous unsolved problem in number theory.