Undergraduate information and computing science, which is better, financial mathematics, postgraduate entrance examination, operational research and control, applied mathematics or probability statistics? Major in computational mathematics, focusing on computational complexity;

There are many miscellaneous directions in operational research and cybernetics;

There are many branches in various disciplines. You must choose a good tutor when applying for graduate students. Since we should focus on application, we should look for a tutor in this field, or what we do must be theoretical.

There are applications in that direction.

For example, an academician of Xi Jiaotong University does functional analysis, which is a relatively theoretical subject in mathematics, but he applies it to the visual system. Now there is a 973 project with more than 30 million yuan.

Another example is the formation of robots. It sounds like an application to you, but if you search for multi-agents, you will find that most of them do theory.

Another example is basic mathematics and number theory, which are abstract enough. Professor Wang Xiaoyun of Shandong University (I don't know which school I am in now, Baidu). . It is this knowledge that is applied to cryptography. Solving MD5 will still shock the world!

So a topic is nothing more than application and theory. The key is whether your tutor has found the background of the application.