If the brain wants to be flexible, it must learn mathematics. There is quite a truth in this sentence. Mathematics can cultivate people's three major thinking: first, reverse thinking. The story of Sima Guang smashing a jar is a classic example of using reverse thinking. The second is divergent thinking, which is the ability to solve multiple problems in mathematics; The third is systematic thinking. Anyone who lives in one or more relative systems must learn to look at problems in the system and look at problems from the overall situation and the whole. As the saying goes, if the system is to achieve harmony, the members of the whole system must have a high degree of system awareness and cannot simply look at the problem in isolation and one-sidedly.

There are two important calculations in calculus: differential calculation and integral calculation, one positive and one negative, which are typical inverse operations in mathematics, each in a system. The appearance of calculus has solved many practical problems and played a strong fundamental role in the development of the whole science, especially physics. It can be said that without the birth of calculus, physics will stagnate and the whole society will return to16th century. Therefore, all universities should offer the course of Calculus, so that students can understand Calculus, further establish scientific consciousness, learn science, know science and apply science, firmly establish Scientific Outlook on Development and become a qualified contemporary college student.