During the day, he is an ordinary wage earner who is responsible for packing the goods in the warehouse. In the evening, he is a math enthusiast, always calculating something in that old notebook. Even his colleagues ask him to go out to play, he will refuse and continue to calculate problems. Finally, he succeeded. The logistics worker solved the mathematical problem that puzzled scientists for a hundred years! Even the professor of Zhejiang University invited him to give a lecture. Who is he? How did you do it?

Yu Jianchun was born in a rural family in Henan Province in 1983. His parents died early. Although Yu Jianchun was interested in learning since he was a child, Yu Jianchun's grades were not so good because the rural education conditions were not very good, but he still wanted to study. He decided to continue his studies, so he went to Xinxian Vocational Middle School, and later he was admitted to Zhengzhou Animal Husbandry College, where he studied animal husbandry.

Yu Jianchun thought that he could become a veterinarian after graduation. I heard that this line of work is very profitable, but the reality is not so easy. Yu Jianchun couldn't find a related job for a long time, so he had to work everywhere to make a living. After graduating for more than 1 years, he has been wandering around, but no matter how hard the days are, Yu Jianchun never gave up one thing-studying mathematics.

Yu Jianchun always carries a notebook with him, which is filled with various formulas and calculus. Every time Yu Jianchun goes to work in a new city, he will take his notebook to visit the local university at the first time to verify whether his mathematical algorithm is correct, and what he studies is the world-class mathematical problem "Carmichael number" (for the composite number n, if all positive integers B that are coprime with N have the congruence formula B (n-1) ≡ 1 (mod n), then the composite number N is called. )

So how did Yu Jianchun, with average grades, begin to study "Carmichael number"? It turned out that during his study in Zhengzhou College of Animal Husbandry, Yu Jianchun inadvertently borrowed a book "Mathematical Conjecture" from the library. At first, he just flipped through it, but the more he read it, the more interesting it became, and he became interested in number theory. Since then, he has been out of control. After more than ten years of efforts, he finally found out several formulas. Once these formulas are feasible, people can find more "Carmichael Numbers" in a shorter time.

However, due to Yu Jianchun's lack of a solid foundation in mathematics, many deduction processes are carried out by "intuition", and he also bluntly said that he can't read textbooks. Therefore, even though he sent his formula to many "big coffees" in mathematics for many years, there was no response, and no one was willing to discuss "Carmichael number" with him.

Fortunately, Yu Jianchun didn't give up. Every time he went to a new city, he would send his own manuscript to the university here. Finally, God paid off. In May 216, Cai Tianxin, a professor of mathematics at Zhejiang University, opened Yu Jianchun's letter and manuscript. After carefully reading the manuscript of this strange logistics worker, he was amazed on the spot and immediately invited him to Zhejiang University for face-to-face discussion.

Yu Jianchun was very excited. He took a day off, put on his most energetic clothes, and brought his own manuscript to Zhejiang University. In front of him, there were professors, deans and doctoral students, which made Yu Jianchun, who graduated from technical secondary school, very nervous. But when he officially began to explain his own calculations, this tension suddenly disappeared. Yu Jianchun spoke his own opinions on the podium with great enthusiasm, and the teachers under the stage followed him in the world of mathematics.

When Yu Jianchun finished, the audience applauded warmly, and Yu Jianchun smiled shyly. Then, the news that "logistics workers cracked Carmichael's number" spread all over the country, and countless journalists and media ran to interview him. Even a foundation took the initiative to sponsor him to study for further study after learning about Yu Jianchun's deeds, so that he could make up his math foundation.

Later, a group in Zhejiang Province offered Yu Jianchun a job on its own initiative, and promised to give him plenty of time to expand his interest and talents in mathematics. I look forward to more discoveries from this folk math wizard in the future!