February 21, 1978 (, Wu Wu fifteenth), Zhang thickness function theory up to the world level.

1978 young mathematician Zhang thick functional theory study has the important achievements of the world level. He successfully found deficient values ​​of entire functions or meromorphic functions, asymptotic value and Ru Liya direction of (a strange direction) the organic link between the three, to make this link a specific mathematical argument, indicating that the entire function or meromorphic functions reflect the objective laws. Asymptotic value theory, Zhang thickness function theory up to the world level "target =" _blank "> Zhang thickness International for many years does not solve the four problems in one fell swoop answers.