This sentence is a famous saying of Leonardo da Vinci.

Leonardo da Vinci believed that in science, where mathematics is not used and where it has nothing to do with it is unreliable, and mathematics is the basis of all sciences.

All kinds of mechanical drawings, animal and plant drawings he drew, and every job he did benefited from the accuracy of mathematics.

Before Columbus, Leonardo da Vinci calculated that the radius of the earth was more than 6000 kilometers.

He also discovered the area law among regular hexahedron, sphere and cylinder in solid geometry.

Extended data:

Leonardo da Vinci's scientific thought;

At first, people only studied Aristotle's theory like the Bible, and only believed in written records.

Leonardo da vinci objected to scholasticism taking past teaching and speeches as the knowledge base. He encouraged people to learn from nature and seek knowledge and truth from nature.

He believes that knowledge comes from practice, and we should start from practice and explore the mysteries of science through practice.

He said that "it is the greatest misfortune that theory is divorced from practice" and "practice should be based on good theory".

Leonardo da Vinci put forward and mastered this advanced scientific method, and applied it to scientific research, making great contributions to natural science.

This method proposed by him was later developed by Galileo and theoretically summarized by British philosopher Bacon, and became the most basic research method of modern natural science.

Leonardo da Vinci believed in science. He hated religion and attacked the authorities in Catholicism as "peddlers of deception and lies".

He said, "There is only one truth. He doesn't believe in religion, but believes in science.

Leonardo da Vinci's experimental working method opened up a new way for the inventions of Copernicus, Galileo, Kepler, Newton, Einstein and others.