Like the blackboard newspaper, handwritten newspaper is also a mass propaganda tool. Next, I will bring you a handwritten newspaper of high school mathematics for reference only, hoping to help you.
The development of Goldbach conjecture
One of the Three Difficult Problems in Mathematics —— Goldbach Conjecture
Goldbach is a German middle school teacher and a famous mathematician. He was born in 1690, and was elected as an academician of Russian Academy of Sciences in 1725. 1742, Goldbach found in teaching that every even number not less than 6 is the sum of two prime numbers (numbers that can only be divisible by themselves). For example, 6=3+3, 12=5+7 and so on.
1742 On June 7th, Goldbach wrote to Euler, a great mathematician at that time, and put forward the following conjectures: (a) any >; Even number =6 can be expressed as the sum of two odd prime numbers.
(b) Any odd number > 9 can be expressed as the sum of three odd prime numbers.
This is the famous Goldbach conjecture. In his reply to him on June 30th, Euler said that he thought this conjecture was correct, but he could not prove it. Describing such a simple problem, even a top mathematician like Euler can't prove it. This conjecture has attracted the attention of many mathematicians. Since Fermat put forward this conjecture, many mathematicians have been trying to conquer it, but they have not succeeded. Of course, some people have done some specific verification work, such as: 6 = 3+3, 8 = 3+5, 10 = 5+5 = 3+7, 12 = 5+7,14 = 7+7 = 3+/kloc. Someone checked the even numbers within 33× 108 and above 6 one by one, and Goldbach conjecture (a) was established. However, the mathematical proof of lattice test needs the efforts of mathematicians.
Since then, this famous mathematical problem has attracted the attention of thousands of mathematicians all over the world. 200 years have passed and no one has proved it. Goldbach conjecture has therefore become an unattainable "pearl" in the crown of mathematics. It was not until the 1920s that people began to approach it. 1920, the Norwegian mathematician Bujue proved by an ancient screening method, and reached the conclusion that every even number with larger ratio can be expressed as (99). This method of narrowing the encirclement is very effective, so scientists gradually reduced the number of prime factors in each number from (99) until each number is a prime number, thus proving "Goldbach".
At present, the best result is proved by China mathematician Chen Jingrun in 1966, which is called Chen's theorem? "Any large enough even number is the sum of a prime number and a natural number, and the latter is just the product of two prime numbers." This result is often called a big even number and can be expressed as "1+2".
Before Chen Jingrun, the progress of even numbers can be expressed as the sum of the products of S prime numbers and T prime numbers (referred to as the "s+t" problem) as follows:
1920, Bren of Norway proved "9+9".
1924, Rademacher proved "7+7".
1932, Esterman of England proved "6+6".
1937, Ricei of Italy proved "5+7", "4+9", "3+ 15" and "2+366" successively.
1938, Byxwrao of the Soviet Union proved "5+5".
1940, Byxwrao of the Soviet Union proved "4+4".
1948, Hungary's benevolence and righteousness proved "1+c", where c is the number of nature.
1956, Wang Yuan of China proved "3+4".
1957, China and Wang Yuan successively proved "3+3" and "2+3".
1962, Pan Chengdong of China and Barba of the Soviet Union proved "1+5", and Wang Yuan of China proved "1+4".
1965, Byxwrao and BHHopappB of the Soviet Union and Bombieri of Italy proved "1+3".
1966, China Chen Jingrun proved "1+2".
Who will finally overcome the problem of "1+ 1"? It is still unpredictable.
Goldbach conjecture is called "the jewel in the crown of mathematics", and countless mathematicians have made a lot of efforts to overcome this difficulty, and even struggled for life. Although Goldbach's conjecture has not been solved yet; But in the process of solving problems for more than 250 years, many mathematical methods have been born, which have provided powerful help for solving other mathematical problems. From this point of view, the practical significance of Goldbach conjecture has gone far beyond the proof of a mathematical proposition itself.
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