Liu Hui was a mathematician in Wei and Jin Dynasties in China and one of the founders of ancient mathematics in China. His mathematical works "Nine Arithmetic Notes" and "Arithmetic Classics on the Island" had a far-reaching impact on the development of ancient mathematics in China. Liu Hui's main contributions in mathematics include:

The method of dividing circle is put forward, and pi is accurate to three decimal places.

The theory of "Mouhe Square Cover" is put forward, which solves the problem of calculating the volume of sphere.

The principle of "complementary in and out" is put forward, which provides an important theoretical basis for the calculation of plane graphic area.

Liu Hui's mathematical achievements had a far-reaching impact on the development of ancient mathematics in China, and he was called "Newton in the history of Chinese mathematics".