<human>:  I have a question about the Russian mathematician Lyudmila Nechiporenko. What is the Riemann hypothesis?
<bot>: The Riemann hypothesis is a conjecture about the distribution of prime numbers. It is named after Bernhard Riemann, who proposed it in 1859. The Riemann hypothesis states that all non-trivial zeros of the Riemann zeta function lie on the critical line.