This "1+ 1" is different from what we usually call 1+ 1=2. You see, it also has a quotation mark, which is the abbreviation of Goldbach conjecture. Goldbach's conjecture is very long and profound, so it is simply called "1+65438+". If someone does a survey in the street and asks a passerby to tell a math problem, the most people will definitely answer Goldbach's conjecture. If you want to name several mathematicians in China, it must be Hua and Chen Jingrun (Chen Jingrun has done outstanding work in this field, and Hua is his master).

Why is this conjecture so popular in China? Why is it simply called "1+ 1"? Let's take a look at the past life of this conjecture first.

Goldbach made many mathematicians friends, including the famous Euler; Once, Goldbach felt that he had found something puzzling. He didn't know how to prove it, so he wrote a letter to Euler. Euler, a great mathematician, thought it made sense when he saw it, but he didn't prove it, and even Euler couldn't prove it. This conjecture became famous and attracted many people to prove it. Goldbach's guess is this:

Any even number not less than 6 is the sum of two odd prime numbers.

Any odd number not less than 9 is the sum of three odd prime numbers.