Circulation rate is widely used.
Qin
Qin (1202~ 126 1) was an outstanding mathematician in ancient China. Anyue people. Qin, Yang Hui and Zhu Shijie are also called the four great mathematicians in Song and Yuan Dynasties. During the period of four to seven years (1244 to 1247), while mourning for his mother, Song Chun edited and sorted out the long-term accumulated mathematical knowledge and research results, wrote the famous masterpiece "Nine Chapters of Counting Books" and created "It's Hard to Find a Skill". This was not only in the leading position in the world at that time, but also played an important role in modern mathematics and modern electronic calculation design, and was called "China's remainder theorem". His theory of "pros and cons" is called "Qin scheme". Now, almost all countries in the world have been exposed to his theorems, laws and problem-solving principles in mathematics courses from primary schools to middle schools to universities. Qin's achievements in mathematics were more than 800 years earlier than those of British mathematicians.
Liu Hui (born around 250 AD) is a very great mathematician in the history of Chinese mathematics, and also occupies a prominent position in the history of world mathematics. His representative works "Nine Arithmetic Notes" and "Calculation on the Island" are the most precious mathematical heritages of China. Nine Chapters Arithmetic was written in the early Eastern Han Dynasty, with 246 solutions. In many ways, such as solutions. They all belong to the advanced ranks in the world, but due to the primitive solution and the lack of necessary proof, Liu Hui made supplementary proof for them. These proofs show his creative contributions in many aspects. He was the first person in the world to put forward the concept of decimal, and used decimal to represent the cube root of irrational numbers. In algebra, he correctly put forward the concept of positive and negative numbers and the principles of addition and subtraction. The solution of linear equations is improved. In geometry, the secant method is put forward, that is, the method of finding the area and perimeter of a circle by using inscribed or circumscribed regular polygons. He scientifically obtained the result that pi = 3. 14 by using secant technology. He cut a regular hexagon from a circle with a diameter of 2 feet by secant method, and got 14 in turn. The smaller the difference between the area of a regular polygon and the area of a circle, in his original words, it means "if you cut it carefully, it will be cut, and it will be integrated with the circle without losing anything." He calculated the area of 3072 polygons and verified this value. The scientific method of calculating pi put forward by Liu Hui has established China's leading position in the world for more than 1000 years.