In our daily life, mathematics is everywhere: just like CD players, cars and computers ... without mathematics, any kind of technology and instrument is unimaginable. However, this theme is not so popular.

Many people have been particularly afraid of mathematics since they were students, thinking that mathematics is boring, far from life and difficult to understand. In this book, the famous mathematician and science journalist Dr. Wolfgang Bloom expressed a completely different view from those prejudices.

From the invention of numbers thousands of years ago to the problems of mathematical research now, this book is involved and discussed. In the world of mathematics, space, probability and password, we feel more and more clearly that mathematics is by no means boring, but a subject full of beauty and charm, which can make people intoxicated.

Arabic numerals In our life, we often use the numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Do you know who invented these numbers?

These numerical symbols were first invented by ancient Indians, and later spread to Arabia, and from Arabia to Europe. Europeans mistakenly think that it was invented by Arabs, so they call it "Arabic numerals" because it has been circulating for many years.

People call it easy, so there are still people who mistakenly believe that these numerical symbols invented by ancient Indians are called Arabic numerals. Now, Arabic numerals have become the universal digital symbols all over the world.

Hua, a famous mathematician, is an internationally renowned mathematician. He has made outstanding contributions in a wide range of mathematical fields, such as analytic number theory, matrix geometry, multi-complex variable function theory, partial differential equations and so on. Because of his contribution, many theorems, lemmas, inequalities and methods are named after him.

In order to promote the optimization method, Hua personally led a small team to 27 provinces to promote the application of mathematical methods for more than 20 years, which achieved obvious economic and social benefits and made great contributions to China's economic construction.

Mathematics handwritten newspaper materials Interesting math questions Which hotel do three people stay in for one yuan? The price per person per day is 10 yuan, and everyone pays 10 yuan, giving the boss 30 yuan in total. Later, the boss gave them a five-dollar discount and asked the waiter to return it to them.

As a result, the waiter embezzled two yuan, and the remaining three yuan was refunded one yuan each, that is to say, each person spent 9 yuan money. Three people spent a total of * * * 27 yuan, plus 2 yuan, a corrupt waiter, spent a total of * * * 29 yuan. Where did the dollar go?