About Mathematics

Hua has been struggling in the national disaster all his life. He often says that he has experienced three disasters in his life. Poor from a small family, out of school, seriously ill, and disabled in both legs. During the second disaster in War of Resistance against Japanese Aggression, it was isolated from the world and lacked reference books. The third disaster was the "Cultural Revolution". His home was searched, his hand was lost, he was forbidden to go to the library, and his assistants and students were assigned to other places. In such a harsh environment, you can imagine how much effort you have to make and how much you have achieved.

As early as 1940s, Hua was one of the leading mathematicians in the field of number theory. But he is not satisfied, he will not stop, he would rather start a new stove, leave number theory and learn algebra and complex analysis that he is not familiar with. How much perseverance and courage are needed!

Hua is good at telling profound truth in vivid language. These words are concise, philosophical and unforgettable. As early as the SO era, he proposed that "genius lies in accumulation, and cleverness lies in diligence". Although Hua is brilliant, he never mentions his own talent. Instead, he regards "diligence" and "accumulation", which are much more important than cleverness, as the key to success, and repeatedly educates young people to learn mathematics so that they can exercise themselves all the time. In the mid-1950s, in response to the problem that some young people in the Institute of Mathematics were complacent after making some achievements, or kept writing papers at the same level, Hua put forward in time: "There must be speed and acceleration." The so-called "speed" means producing results, and the so-called "acceleration" means constantly improving the quality of results. Just after the "Cultural Revolution", some people, especially young people, were influenced by bad social atmosphere, and some departments were eager for success, frequently demanding grades, evaluating bonuses and other practices that were not in line with scientific laws, which led to the corruption of the style of study. Performance for shoddy, fame and fortune, wanton boasting. 1978, he earnestly put forward at the Chengdu conference in chinese mathematical society: "Early publication, late evaluation." Later, it was further put forward: "Efforts are in me, and evaluation is in people." This actually puts forward the objective law of scientific development and scientific work evaluation, that is, scientific work can gradually determine its true value after historical test, which is an objective law that is independent of human subjective will. "

Hua never hides his weaknesses. As long as he can learn, he would rather expose them. When he visited Britain at the age of seventy, he changed the idiom "Don't teach others an axe" to "teach others an axe" to encourage himself. In fact, the previous sentence is that people should hide their shortcomings and not expose them. Did Hua go to college to help others with their expertise, or did he turn lectures into formalism because he didn't specialize in others? Hua chose the former, that is, "wait a minute, and you will arrive at the door." As early as the 1950s, Hua compared mathematics to playing chess in the preface of Introduction to Number Theory, calling on everyone to find a master, that is, to compete with great mathematicians. There is a rule in chess in China, that is, "A gentleman does not regret watching chess without saying a word". 198 1 year, in a speech in Huainan coal mine, Hua pointed out: "Watching chess is not a gentleman, help each other; I regret the gentleman and change my shortcomings. " It means that if you see someone else's work problems, you must speak up. On the other hand, when you find something wrong with yourself, you must correct it. These are "gentlemen" and "husbands". In view of the fact that some people retreat when they encounter difficulties and lack the spirit of sticking to the end, Hua wrote on a banner for Jintan Middle School: "People cannot say that the Yellow River will not die, but I say that the Yellow River will be stronger."

When people get old, their energy will decline, which is a natural law. Hua knows that time waits for no man. 1979 when he was in England, he pointed out: "The village is old and easy to empty, and people are old and easy to disperse. The scientific approach is to abstain from empty and scattered. I am willing to stick to it all my life. " This can also be said to be his "determination book" to fight against his aging with the greatest determination, so as to spur himself. The patient with the second myocardial infarction in Hualuosuo still insisted on working in the hospital. He pointed out: "My philosophy is not to prolong life as much as possible, but to do more work during the day." If you are ill, you should listen to the doctor and have a good rest. But his indomitable spirit is still valuable.

In a word, all of Hua's expositions are permeated with a general spirit, that is, constant struggle and continuous progress.

Mathematical famous sayings

Numbers rule the universe. Pythagoras

Mathematics, the queen of science; Number theory, the queen of mathematics. ——C？ f？ Gauss

God created integers, and the rest are man-made. ——L？ leopold kronecker

God is a mathematician-jacoby.

A mathematician who is not a poet will never be a complete mathematician. -Wilstes

Pure mathematics, in its modern development stage, can be said to be the most primitive creation of human spirit. -Baishihai

Countable genus rules the whole world of quantity, and four operations can be regarded as all the equipment of mathematicians. Maxwell

numbers game

The word sudoku comes from Japanese, which means "a single number" or "a number that appears only once". Simply put, it is a numbers game. But this concept was originally not from Japan, but from Latin squares, which was invented by Swiss mathematician Euler in the18th century. Born in 1707, Euler is considered as one of the greatest mathematicians of all time.

1783, Euler invented a "Latin Rubik's Cube", which he called a "new Rubik's Cube". This is the embryonic form of Sudoku. However, Euler's invention was not taken seriously at that time. It was not until the 1970s that American magazines relaunched it in the name of "digital puzzle".

The rules of Sudoku are very simple. There are several numbers in the 9x9 square, and the other squares are left blank. Players need to work out what numbers are in the remaining spaces according to logic, so that each row and column has a number of 1 to 9, and each Xiao Jiu grid also has a number of 1 to 9. A number can only appear once in each row and each Xiao Jiu grid.

To play this game, you don't need language skills and cultural knowledge like crossword puzzles, or even complicated math skills. Because it doesn't need addition, subtraction, multiplication and division at all. Of course, you must not underestimate it, it is not so easy to be "subdued". When you meditate with a pen, these nine numbers are likely to give you a headache, a rapid pulse and restlessness. However, when you successfully fill in all the figures, you will be ecstatic. Some Sudoku fans claim that university professors are likely to lose to factory workers when playing this game.