1+ 1 is a mathematical expression of Goldbach's conjecture, which means that any large enough even number can be decomposed into the sum of two prime numbers. For example, 10=3+7, 100=47+53 and so on. It is not Goldbach's conjecture, but to prove that 1+ 1=2 Chen Jingrun did not finally prove Goldbach's conjecture. What he proved can be expressed as 1+2, that is to say, any large enough even number is.