1, Riemann conjecture is an unsolved problem in mathematics, which involves the regularity of prime number distribution. Specifically, Riemann conjecture holds that the distribution of prime numbers can be described by a complex function called Riemann function, and the zero position of this function has certain regularity.

2. This conjecture was put forward by German mathematician Bernhard Riemann in 1859, and it has not been strictly proved so far. However, Riemann conjecture has important application value in number theory, calculus, physics and other fields, especially in modern cryptography. In addition, Riemann conjecture is also considered as one of the most difficult and important problems in mathematics, and its solution is of great significance to the development of mathematics.