First, at that time, the Soviet Union was competing with the United States, and the state had to give strong support to researchers. The most important things in military science and technology are basically mathematics and physics.

Second, it was related to the attitude of Soviet researchers at that time. I like reading books compiled by poor Soviets in the library best. Looking at the physics books written by the Soviets, many examples will be given in order to get a small definition. The formula derivation in the math book will not evade the important, but will understate the words "this proof is too complicated and omitted here". After reading more, you will find that Soviet mathematicians have a really strong ability to push formulas by hand!

At present, the requirements of our university education (non-mathematics majors) are getting lower and lower. Teachers like to say, "it can be used, and you don't need to know how to do it." Computers are playing an increasingly important role in scientific research. Think about any complicated operation in your mind, and then simulate it with software. There is no need to rack one's brains to think about the specific implementation process of each step. This can improve efficiency, but it also causes the lack of basic theoretical knowledge.