Pythagoras, an ancient Greek mathematician and philosopher, studied under Thales and Anaquel Simonde. Whether it is to explain the external material world or to describe the internal spiritual world, mathematics is indispensable! Pythagoras, who lived 2500 years ago, was the first person to realize that there are laws at work behind everything. Pythagoras was born on the Aegean island of Samos (an island in eastern Greece today). He was smart and studious since childhood, and studied geometry, natural science and philosophy with famous teachers. Later, longing for the wisdom of the East, he came to Babylon, India and Egypt via Qianshan, and absorbed the culture of Arab civilization and Indian civilization (480 BC).

Dagoras was born in Samos Island in the eastern Aegean Sea, and he was smart and studious since childhood. He studied geometry, natural science and philosophy under the guidance of famous teachers. He believes that "everything is number", "number is the essence of everything" and "the principle of existence", and the whole universe is a harmonious system of numbers and their relationships. In this sense, he understood number as the form and image of natural objects, and it was the total root of all things.

Because of numbers, geometry has a point. With points, there are lines, surfaces and solids. With three dimensions, there are four elements that make up everything: fire, air, water and earth, so number comes before things. All phenomena and laws in nature are determined by numbers, and they all obey the "harmony of numbers", that is, obey the relationship of numbers.

Pythagoras abstracted the number "five" from five apples, five fingers and other things. This is a common thing today, but it was a great progress in philosophy and practical mathematics at that time. In practical mathematics, it makes arithmetic possible.