Pythagoras school is the first school to put the concept of number in a prominent position. They attach great importance to mathematics and try to explain everything with numbers. It is argued that number is the origin of all things in the universe, the essence of things is determined by a certain quantitative relationship, and everything constitutes a harmonious order according to a certain quantitative ratio; Therefore, they put forward the view that "beauty is harmony".

The Pythagorean school believes that "1" is the first principle of numbers, the mother of all things and the mother of wisdom; "2" is the principle of opposition and negation, and it is an opinion; "3" is the shape and shape of everything; "4" is justice and a symbol of the creator of the universe; "5" is odd and even, and the combination of men and women is also marriage; "6" is the life of God and the soul; "7" is an opportunity; "8" is harmony, fraternity and friendship; "9" is rational and powerful; "10" contains all the numbers, perfect and beautiful.

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Pythagoras himself is famous for discovering Pythagoras theorem (called Pythagoras theorem in the west). He proved by deduction that the square of the hypotenuse of a right triangle is equal to the sum of the squares of two right angles, which is Pythagorean theorem.

Given a right triangle, the square of the hypotenuse of the right triangle is equal to the sum of the squares of the two right sides of the same right triangle. And vice versa; If the sum of squares of two sides of a triangle is equal to the square of the third side, the triangle is a right triangle.

This famous theorem is widely used in many branches of mathematics, architecture and measurement. The ancient Egyptians used their knowledge of this theorem to construct right angles. They tied ropes every 3, 4 and 5 units, and then straightened three ropes to form a triangle. They know that the angle opposite to the largest side of a triangle is always a right angle (3+4,5).

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