Thales was an ancient Greek philosopher and mathematician. He studied in Egypt and was attracted by the pyramids in Egypt. It is said that he used similar triangles's principle to measure the height of the pyramids. This may be one of the earliest mathematical applications.

1, Pythagoras and music

Pythagoras was an ancient Greek mathematician and philosopher. He has a strong interest in music and thinks that music and mathematics are closely related. He found that there was a proportional relationship between the length of the string and the pitch. This relationship is still widely used in modern music theory.

2. Euclid and geometry

Euclid was an ancient Greek mathematician and was known as the father of geometry. He wrote The Elements of Geometry, which is a classic math book and one of the earliest math textbooks in the world. Euclid made great contributions to the development of geometry, and his geometric theory was widely used in the fields of architecture, engineering and science.

3. Archimedes and buoyancy

Archimedes was an ancient Greek mathematician and inventor. He discovered the principle of buoyancy, that is, the buoyancy of an object in a liquid is equal to the weight of the liquid it displaces. This principle is widely used in ship design, hydraulic engineering and material science. Archimedes also invented many practical tools and instruments, such as screw pump and catapult.

4. Zu Chongzhi and Pi.

Zu Chongzhi was a mathematician and astronomer in the Southern and Northern Dynasties. He calculated pi accurately and got the value of pi with seven digits after the decimal point. This achievement was the world leader at that time, and it also made important contributions to the later fields of mathematics and science.

5. Cartesian and coordinate system

Descartes was a French mathematician and philosopher in the17th century. He invented the coordinate system and established the connection between geometry and algebra. This invention has a profound influence on analytic geometry, linear algebra and modern mathematics.

6. Fermat and Fermat's last theorem

Fermat was a French mathematician in the17th century. He put forward a famous mathematical problem, namely Fermat's last theorem. This theorem was not completely proved until 1995, which is an important event in the history of mathematics. Fermat's last theorem involves many fields, such as equations, modular operation, number theory and so on, which has a far-reaching impact on the development of mathematics.