Hello, what you want to ask is how difficult it is for Jimmy Dovich? Jimidovich is very difficult. Jimidovich (1906-1977), a Belarusian mathematician, is a professor in the Department of Mathematical Analysis of Moscow University. He made great contributions to the qualitative theory of differential equations. Because of his academic contribution, he was awarded the title of meritorious scientist by supreme soviet of the ussr. His specific research interests include:

1, a dynamical system with integral invariants.

2. Periodic solutions of ordinary differential equations.

3. Well-posed and completely well-posed dynamic systems.

4. Limit solutions of differential equations.

5. Stability theory of dynamic system. His works include a set of mathematical analysis exercises and a book "Mathematical Theory of Stability" which is widely used as a reference book for related disciplines in Russia. Therefore, it is difficult for Jimidovich.