1. Qin's year of birth and death has not been accurately recorded. We only know that he was active in the Southern Song Dynasty, probably between 1208 and 126 1. He was born in Tongchuan County (now chuanshan district, Suining City, Sichuan Province) and was the son of Qin Ding, an official of the Southern Song Dynasty. Qin was brilliant since he was a child and had a strong interest in mathematics.

2. Qin's achievements in mathematics are mainly reflected in his book Several Books and Nine Chapters. Shu Shu Jiu Zhang is a mathematical monograph, which covers a large number of mathematical problems, involving arithmetic, algebra, geometry and other fields. This book contains 1893 examples, and systematically introduces algebra, equations, permutations and combinations, and other mathematical contents.

3. In Shu Shu Jiu Zhang, Qin put forward the idea of "seeking skills through extensive exploration", which was a major breakthrough in China's ancient mathematics. The main content of this theory is that for any natural number n, a unique positive integer x can be found, so that the remainder of x-norm n is 1. This theory laid the foundation for the later study of number theory.

Mathematics related content

1. Mathematics originates from human exploration and interpretation of the surrounding world. The earliest mathematical concepts of mankind can be traced back to counting and measuring, such as calculating quantity, comparing size, measuring length and so on. With the development of society, mathematics has gradually expanded from simple counting and measurement to a wider field, including algebra, geometry, probability theory and so on.

2. The research object of mathematics is abstract and universal. Abstraction means that mathematical concepts are often independent of specific things, such as numbers, shapes, sizes, etc., and they are all abstract concepts. Universality means that mathematical laws can be applied to various phenomena without mathematical support, such as physics, chemistry, biology and other fields.

3. Mathematics is widely used and important. In the field of science, mathematics is used to describe natural and social phenomena, such as physics, chemistry, biology, economics and so on. In the field of engineering technology, mathematics is used to solve practical problems and design new products, such as architecture, machinery, electronics, aerospace and so on.