1742 On June 7th, Goldbach put forward the S conjecture. Goldbach put forward the following conjecture in a letter to Euler in 1742: any integer greater than 2 can be written as the sum of three prime numbers. Because the saying that 1 is also a convention of prime numbers is no longer used in the field of mathematics, the modern saying of the original conjecture is that any integer greater than 5 can be written as the sum of three prime numbers. Euler also put forward another equivalent version in his defense, that is, any even number greater than 2 can be written as the sum of two prime numbers.

Today's * * * identity conjecture is expressed as Euler version. Any even number large enough to write a proposition can be expressed as the sum of a number that does not exceed one prime factor and another number that does not exceed b prime factors. In 1966, Chen Jingrun proved that 12 holds, that is, any sufficiently large even number can be expressed as the sum of two prime numbers, or the sum of a prime number and a half prime number.

This question was put forward by the German mathematician C Goldbach in a letter to the great mathematician Euler on June 7, 742/KLOC-0, so it is called Goldbach conjecture.

Chen Jingrun: The first mathematician in the world to conquer Goldbach's conjecture.

Goldbach is a German mathematician. Born in Konigsberg; Studied at Oxford University in England; As a result of studying law, I became interested in mathematical research because I met the Bernoulli family when I visited European countries. Worked as a middle school teacher.

/kloc-went to Russia in 0/725, and was elected as an academician of Petersburg Academy of Sciences in the same year. 1725 to 1740 as conference secretary of the Academy of Sciences in Petersburg; 1742, he moved to Moscow and worked in the Russian Foreign Ministry. In Xu Chi's reportage, Chinese people learned about Chen Jingrun and Goldbach's conjecture. So, what is Goldbach conjecture?

Goldbach conjecture can be roughly divided into two conjectures: 1. Every even number not less than 6 is the sum of two odd prime numbers; 2. Every odd number not less than 9 is the sum of three odd prime numbers.

China mathematician Chen Jingrun proved in 1966 that any sufficiently large even number is the sum of a prime number and a natural number, which can be expressed as the product of two prime numbers. This result is usually expressed as 1/2. This is the best result of this problem at present. One of the biggest guesses, how many people have paid their lives for this! We are proud that this conjecture was conquered by China mathematician Chen Jingrun.

Progress on question b

1920, Norway's Brown proved 99. In 1924, Latmach of Germany proved that 77. 1932, Esterman proved that 66. 1937, Lacey, Italy successively proved 57, 49, 3 15, 2366. 1938, Bukhitab of the Soviet Union proved that 55.

1940, Bukhitab of the Soviet Union proved that 44. 1956, which was proved by Wang Yuan in China. Later, 3 3 and 2 3 were proved. 1948, Rennie of Hungary proved 1c, where c is a natural number. 1962, Pan Chengdong of China and Barba of the Soviet Union proved 1/5, and Wang Yuan of China proved 1/4.

1965, Boucht and vinogradov Jr. in the Soviet Union and Pemberley in Italy proved 1/3. 1966, China Chen Jingrun certificate 1/2.