2. Zu Chongzhi's outstanding achievement in mathematics is about the calculation of pi. Before the Qin and Han Dynasties, people took "the diameter of three weeks a week" as pi, that is, "the ancient rate". 3. The French mathematician Lagrange (1736.1.25 ~1813.4.10) once said: "As long as algebra and geometry go their separate ways, their progress will be slow and their application will be narrow. However, when these two kinds of science are combined into partners, they absorb fresh vitality from each other. Since then, it has been making rapid progress. "
4. China mathematician Hua (1910/2 ~1985.6.12) said: "Numbers and shapes are interdependent, how can they fly on both sides? Without numbers, it is not so intuitive, and without numbers, it is difficult to be nuanced. The combination of form and number is good in all aspects, but everything is wrong without it. Don't forget, the unity of geometry and algebra is always connected and never separated! " 5. Cartesian coordinate system is different from general theorems and general mathematical theories. It is a kind of thinking method and skill, which has completely changed the whole mathematics and made Descartes one of the founders of modern mathematics. 6. Gauss (C.F. Gauss,1777.4.30 ~1855.2.23) is a German mathematician, physicist and astronomer, who was born in a poor family in Zwick, Germany. 7. Pythagoras (Pythagoras, 572 BC? ~ 497 BC? ), an ancient Greek mathematician and philosopher. 8. Qian Xuesen 19 1 1 was born in Shanghai, and 1934 graduated from Shanghai Jiaotong University. In order to serve the motherland better, he was admitted to MIT for further study on 1935, and transferred to California Institute of Technology for further study on 1936, where he studied aviation engineering theory under the famous aviation scientist von Carmen. Qian Xuesen studied hard, got his doctorate three years later, and stayed in school to teach. Under the guidance of von Carmen, Qian Xuesen became interested in rocket technology and made great progress in the research fields of high-speed aerodynamics and jet propulsion. Soon, under the recommendation of Von Carmen, Qian Xuesen became the youngest tenured professor of California Institute of Technology.