Tao Yuanming was an official for more than 80 days, resigned and retired to the mountains "under the hedge of chrysanthemum picking, leisurely seeing Nanshan"; Jie Zhitui accompanied his son Zhong Er to suffer from exile, but after helping Zhong Er return to China, he resigned from his official position and hid in the mountains with his mother. Qian Zhongshu, a great scholar, has never been interviewed by any media reporter or even CCTV reporter, and devoted himself to literary creation. Hybrid rice became rich in Yuan Longping, refused to be hired by foreign countries with high salaries, did not apply for patents for research results, and truly took it as its responsibility to solve people's food and clothing; Madame Curie won numerous awards in her life. When someone asked her why she let her children play medals, she replied: "It is to let children know that honor can only be played. If you keep it, you will never achieve anything. "

"Don't worry about wealth, don't use it", Yu Jianchun is such a person. As a courier, he solved the world's problems, but turned down all the jobs that wanted him to become famous. He only replied to reporters that he wanted to marry a daughter-in-law and have a stable home.

Family conditions are difficult, so I have to drop out of school to make a living.

Yu Jianchun was born in a rural area in Xinyang, Henan. His parents have been hardworking and honest farmers all their lives, and their family conditions are not very good. Yu Jianchun showed his talent in mathematics when he was a child. In elementary school, he was often accused of being too partial because of his outstanding achievements in mathematics and mediocre achievements in other subjects.

As the saying goes, interest is the best teacher. Some children of the same age like reading, playing ball games and playing games. Yu Jianchun's interest is mathematics, which may give a bunch of students a headache. Whenever he has free time, Yu Jianchun will find out math problems to play with. The neighbors' brothers and sisters watched while studying. Although he doesn't understand those theories, he has his own way of thinking.

However, because of his minor subjects, Yu Jianchun's overall performance is not good, even a little "scum", and his family conditions do not allow him to continue his studies. Therefore, after graduating from junior high school, Yu Jianchun did not continue to study culture, but entered a junior college to enroll in animal husbandry and study technology.

After graduating from junior college, Yu Jianchun began to live a wandering life, working as a weather-beaten security guard and a reinforced concrete construction worker. He has worked in Wuhan, Suzhou, Shanghai, Kaifeng and Guangzhou. Later, Yu Jianchun found a job as a courier and packer in Hangzhou Logistics Company.

I studied mathematics for ten years in my spare time.

Ye Zhi once said, "But as one grows older, his dreams will no longer be bright. He began to weigh life with his hands, paying more attention to fruits than flowers. " Everyone had their own dreams when they were young. Even in later life, for more or less reasons, it didn't come true, but at least they tried.

Although Yu Jianchun chose a road contrary to his own interests, he still left a "small garden" in his heart, which needs careful care. Although he didn't receive higher education or study systematically, Yu Jianchun never gave up his love for mathematics.

The job of a courier is not easy. He works from 8: 00 a.m. to 8: 00 p.m. every day 10, and he packs thousands of boxes a day. But after returning home, in his own small room, Yu Jianchun has his favorite math company. He taught himself mathematics and practiced various calculus in his private time, which, in his own words, was also a way to relax in his busy life.

"Love can last." Yu Jianchun has been immersed in the "ocean" of mathematics for several years. The small house where he lives is full of cursive paper for calculating handwriting. Because of work, Yu Jianchun will also send a courier to the university. Every time I see the teacher giving a lecture in class, the following students listen carefully, and he is still envious.

The university spirit is relatively open and welcomes all those who are eager to learn, so Yu Jianchun will go to the library to borrow math books during the holidays. Mathematics is different from other subjects, and some knowledge points are obscure, especially for people like Yu Jianchun who have no math foundation in high school. Sometimes the train of thought really doesn't work, and Yu Jianchun will summon up the courage to ask the teacher for advice. This attitude has touched many teachers and students.

Overcoming Mathematical Problems in a Confused World

The encounter between Yu Jianchun and Carmichael number came from this, and we first learned Carmichael number from college textbooks. The name of Carmichael number comes from American mathematician carmichael, who discovered this complicated law in 19 12, which shocked the whole world.

Carmichael number, also known as "pseudo prime number", is one of the difficult problems in mathematics in the past hundred years, which many mathematicians and math enthusiasts can't solve. Yu Jianchun solved this problem through his unique thinking and accurate calculation, and Yu Jianchun almost jumped with excitement when he got the result.

Yu Jianchun can't wait to show his research results to others. He contributed articles to many university professors by e-mail, but all of them were like a stone, with no result. One day on 20 16, Yu Jianchun suddenly received a message inviting him to attend a math seminar.

It was originally sent to Yu Jianchun by Professor Cai Tianxin of Zhejiang University. Cai Tianxin was very surprised to see his dense manuscripts and calculus steps. I didn't expect this problem that plagued the world to be solved by this simple young man.

Yu Jianchun followed Cai Tianxin to the seminar of Zhejiang University. He was dressed simply and carefully, and all the experts in the audience questioned him. However, I didn't expect that when I stepped onto the podium and began to demonstrate my calculus steps, Yu Jianchun wrote his calculus process clearly like a different person, and the audience couldn't help clapping. It's hard to imagine this young man in front of us. Although his knowledge system is not perfect, his thinking is amazing.

Become famous overnight, just want to get married

Yu Jianchun's achievements were reported by major media. CCTV News specially produced a two-minute documentary to publicize his story about mathematics, and China Daily even reported it in a large space, praising Yu Jianchun's advanced research achievements.

Even Washington post, The Times and other overseas media rushed to report the story of "hunting China in good faith". Yu Jianchun swept the world overnight, and his inspirational stories and achievements in mathematics amazed everyone.

After the fire, many media and companies wanted to cooperate with Yu Jianchun and arranged a lot of work for him. Faced with these temptations, Yu Jianchun hesitated, but still gritted his teeth and refused these benefits, just smiling "I want to marry a daughter-in-law and have a stable job".

Fame and fortune are tempting, but there are many things in life that are more important than fame and fortune. Every ordinary person has his own "heroic dream". Mathematics is Yu Jianchun's hobby and the joy of life. He doesn't want to let interests pollute his "pure land".