There was a famous mathematician named Pythagoras in Gu Xi. He studied mathematics deeply and made indelible contributions to its development. He was founded at that time. Pythagoras School ". There is a view that "the measurement of everything in the universe can be expressed by integers or the ratio of integers, and there is nothing else." Pythagoras first discovered and proved that "in a right triangle, the sum of the squares of two right-angled sides is equal to the square of the hypotenuse". After proving this theorem, they were very happy inside and outside the school. They slaughtered 100 cows to celebrate. This theorem is called Pythagorean Theorem or Hundred Cows Theorem in Europe and Pythagorean Theorem in China. However, his views and findings made him flustered and almost ashamed in the future. Sipos, a student of Pythagoras, is studious and good at observation, analysis and thinking. One day, he studied this question: "What is the diagonal length of a square with a side length of 1? "According to the Pythagorean theorem, he calculated that the root number was 2 (of course, it would not be said at that time) and found that the root number was neither an integer nor a ratio of integers. He is both happy and confused. According to the teacher, the root number 2 should not exist, but the diagonal line exists objectively and he can't explain it. He told the teacher the results of his research and asked for an explanation. Pythagoras thought for a long time, but he couldn't explain this strange phenomenon. He was terrified, but he dared not admit that the root number 2 was a new number, otherwise the theoretical system of the whole school would face collapse, and he was uneasy. In the end, he took the wrong way: he ordered the news to be blocked, and Siebers was not allowed to study and talk about it again. Under the pressure of Pythagoras, Siebers's mood is very painful. In the face of facts, through long-term thinking, he thinks that the root number 2 exists objectively, and the theoretical system of the knowledge teacher cannot be explained, which shows that the teacher's point of view is problematic. Later, he was desperate to spread his findings and opinions, and the whole school immediately caused a sensation, which also made Pythagoras angry and could not tolerate this "rebellion." "Decided to severely punish Sibos. After hearing the wind, Sibos fled by boat overnight. But he didn't expect that there were several ships chasing behind the ship he was sitting on, and he was still looking forward to a bright future. Before he woke up, the Pythagorean mob appeared in front of him, and he was bound and thrown into the boundless sea. He gave his precious life for his birth! However, the truth is invincible, and the emergence of the root number 2 makes human beings know a new number-irrational number. It also makes mathematics itself have a qualitative leap! People will always remember Sibos, who is the real father of irrational numbers. His spirit of not being afraid of authority, being brave in innovation and sticking to the truth will always inspire future generations!