1953, Qian Sanqiang, a famous scientist, took the Academy of Sciences abroad for inspection. Members include China and Zhao Jiuzhang. Hua wrote the first couplet: "The top three are Han, Zhao and Wei", and asked for the second couplet. The "top three" here shows that Han, Zhao and Wei were all in the Warring States period, but it implies the name of Comrade Qian Sanqiang, head of the delegation.

After a while, when Hua saw that everyone had no bottom line, he revealed his bottom line: "Hook, strand and string are nine chapters." Nine Chapters is a famous mathematical work in ancient China. However, the "Nine Chapters" here happen to be the name of another member of the delegation-atmospheric physicist Zhao Jiuzhang.

2.Descartes

Descartes once went to Sweden and met the beautiful Swedish princess Christina. Descartes found that Princess Christina was very clever, so he became the princess's math teacher, and they were completely immersed in the world of mathematics. When the king learned about this, he thought Descartes was not good enough for his daughter. Not only did he forcibly separate them, but he didn't receive all the letters Descartes wrote to the princess.

Later Descartes contracted the Black Death and sent the last letter to the princess before he died. There is only one line in the letter: r = a (1-sin θ).

The king and ministers naturally didn't understand what this meant, so they had to return it to the princess. The princess established a polar coordinate system on paper, traced the points of the equation on it with a pen, and finally solved the secret of this line. This is a beautiful heart line. It seems that mathematicians have their own romantic ways.

3. Mr. and Mrs. Sachris

At a math party, a beautiful classmate named Esther Klein put forward a conclusion: If you draw five points on a plane at random, there must be four points, and these four points form a convex quadrilateral. Szekeres and Erdos thought for a long time, but they didn't know how to prove it.

So, this beautiful classmate proudly announced her proof that the convex hull of these five points can only be pentagon, quadrilateral and triangle. The first two cases need not be discussed, but for the third case, if two points in a triangle are connected into a straight line, then two of the three vertices of the triangle must be on the same side of the straight line, and these four points form a convex quadrilateral. Everyone shouted brilliantly.

After that, Erdos and Sai Keres were still obsessed with this problem, so they tried to popularize it. Finally, they published a paper in 1935, which successfully proved a stronger conclusion: for any positive integer N ≥ 3, there is always a positive integer m, so as long as there are m points on the plane, a convex N polygon can be found. Ordos named this issue "Happy Ending Problem".

4. Euler

Due to overwork, Euler got an eye disease at the age of 28 and eventually went blind. After Euler was completely blind, he still studied by memory and mental arithmetic until his death, which lasted 17 years. Euler's memory and mental arithmetic are rare. He can retell the contents of his notes when he was young. Mental arithmetic is not limited to simple operations, and advanced mathematics can also be done by heart.

Lagrand began to communicate with Euler at the age of 19 to discuss the general solution of isoperimetric problems, from which the variational method was born. The isoperimetric problem has been considered by Euler for many years, and Lagrange's solution has won Euler's warm praise.

1783 One afternoon in September, Euler invited his friends to dinner to celebrate his successful calculation of the law of balloon rising. At that time, shortly after Uranus was discovered, Euler wrote down the essentials of calculating Uranus' orbit and laughed with his grandson. After drinking tea, he suddenly fell ill, and his pipe fell out of his hand, muttering, "I'm dead." Euler finally "stopped living and calculating".

5. Chen Jingrun

1977, Chen Jingrun was admitted to 309 Hospital due to illness, and met Yu Kun who had just been sent to the hospital for further study from Wuhan Military Region. In the past, Chen Jingrun didn't even touch the edge of a woman's name and didn't even say a word. This time, Chen Jingrun, who is nearly half a century old, saw Yu Kun, his eyes lit up, and he greeted Yu Kun kindly, and he talked too much.

Later, Kun was sent to the ward in Chen Jingrun as a doctor on duty. There are more opportunities for such contact. Every time Kun Yi appears, Chen Jingrun is particularly happy. One day, Chen Jingrun asked Youkun with concern, where does he live? Do you have a boyfriend or family? Yu Kun was unprepared and said bluntly, "No, no, it's still early." Later, Yu Kun also cared about the China mathematician, and they hit it off and fell in love.

Finally, one day, Yu Kun asked the mathematicians around him: "You are a great mathematician, and many people worship you. Why did you choose me? " Facing the beloved girl, Chen Jingrun flushed with anxiety. He doesn't trust young people. It was a long time before Chen Jingrun said, "I thought about it. You don't agree, I will never get married in my life. " It is this sentence that makes Yu Kun no longer hesitate. She accepted Chen Jingrun's feelings frankly and stayed together for 16 years.

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