It is the content of the thirteenth letter written by the famous French mathematician Descartes to his lover Princess Christine. There is only this mathematical formula in this letter, and the whole figure of this formula is made, which is the famous heart line.

Personal data:

Rene descartes, born in Touraine-Descartes, Andel-Loire, France on March 3rd1596, was named after Descartes and died in Stockholm, Sweden on February 3rd 1 1, a French philosopher, mathematician and physicist. He made an important contribution to the development of modern mathematics, and was known as the father of analytic geometry because he formulated the geometric coordinate system.

He is also one of the founders of modern western philosophy and a pioneer of modern idealism, and put forward the idea of "universal doubt". His philosophical thoughts deeply influenced later generations of Europeans and laid the foundation of European rationalism philosophy.

Character life:

At the age of one, his mother died of tuberculosis, and he was also infected, weak and sick. Descartes was ill since childhood, but his family was rich, so the school allowed him to study early. After his mother died, his father moved to another place and remarried, leaving Descartes to his grandmother. Since then, father and son have rarely seen each other.

But his father has been providing financial help so that he can get a good education and pursue his interests without worrying about financial resources. So I have developed the habit of lifelong meditation, and my personality is withdrawn. Seeing that he has the temperament of a philosopher, his father affectionately called him a little philosopher.

Major achievements:

Descartes' contribution to science is various. Descartes not only opened up a new path in the field of philosophy, but also was a scientist who dared to explore. He made commendable innovations in physics, physiology and other fields, especially in mathematics. He founded analytic geometry, which opened the door to modern mathematics and was of epoch-making significance in the history of science.