How did Chen Jingrun prove that 1+1=2-

The so-called "1+1" or "1+2" are just abbreviations. Goldbach conjecture says that any even number greater than 6 can be expressed as the sum of two prime numbers, usually expressed as "1+1". Chinese mathematician Chen Jingrun proved in 1966 that any sufficiently large even number is the sum of a prime number and a natural number, and the latter can be expressed as the product of two prime numbers. Usually this result is expressed as "1+2". This is the best result of this problem at present. Please note that here, "1+1" is just a short name, not one plus one in the arithmetic sense. Chen Jingrun's proof process, I'm afraid it is not here to write down. Even if it is written here, how many people can understand it?

if you mean "1+1" in the arithmetic sense, that is, how to prove that one plus one equals two, then I tell you, there is no need to prove it. One plus one equals two is the main postulate of mathematical axiom system. In other words, one plus one equals two is a postulate, which is self-evident and a prerequisite for the inference of other mathematical theorems. Therefore, there is no question of how to prove that one plus one equals two.

In addition, I want to remind you that what Chen Jingrun proved is not "1+1=2". This is common sense, don't make jokes.