In 1960s, Chinese mathematician Ke Zhao solved a difficult problem that has not been solved in mathematics for more than 100 years, that is, the Cartland problem in the famous class number and indefinite equation of positive definite quadratic form. Ke Zhao's research results are called "Coriolis Theorem" by the international mathematics community. Associated with the Coriolis Theorem is a creative method, the Coriolis Method, which is highly respected internationally. In addition, his research achievements in number theory with mathematician Cherie Sun are internationally known as "Cosson conjecture".