More than 200 years ago, the German mathematician Goldbach discovered that it seems that any even number greater than 2 can be written as the sum of two prime numbers. But he can't prove it, nor can other mathematicians such as Euler. This problem has become a famous Goldbach conjecture in mathematics, and countless heroes have been bowing to it for more than 200 years.

More than 30 years ago, Chen Jingrun was a famous mathematician in China. He proved in 1960s and 1970s that a big even number can be expressed as the sum of the products of a prime number and no more than two prime numbers, or 1+2 for short. His discovery, known as Chen Theorem, is the latest achievement of Goldbach's conjecture, and no one can surpass it so far.

After completing the proof of 1+2, Chen Jingrun devoted a lot of energy to the final proof of Goldbach's conjecture. 1996n3 Chen Jingrun died on 19 in March, and the final proof of Goldbach's conjecture was not completed before his death.

It is proved that 1+2 is the most important mathematical achievement in Chen Jingrun's life. Few people have heard of Chen Jingrun's other achievements besides this one. In fact, studying Goldbach's conjecture can't be completed in a few pages. To thoroughly prove Goldbach's conjecture, it is likely that new mathematical laws and even new branches of mathematics are needed. This puts a high demand on researchers, which requires not only a solid mathematical foundation, but also a very strong scientific research ability.

You see that Chen Jingrun has proved the glory after 1+2. You didn't see how much he paid for it, and you don't know how much he paid after that. Through literature review, we can see that after Chen Jingrun became famous, several papers were published almost every n years, even in the month of his death, papers were published in the Journal of Mathematics. Most of these papers are in the field of number theory, and many of them are closely related to Goldbach conjecture. Although Chen Jingrun didn't finally prove Goldbach's conjecture, his work will pave the way for other researchers.

It is not easy for scientists to make a research achievement, especially a major research achievement. Even a very outstanding scientist may have only one or two valuable research achievements in his life. It was not easy for Chen Jingrun to achieve 1+2 at that time, and it is not very common for scientists who study so hard as he does now. That spirit can be more important than 1+2 to some extent.