The story of mathematician Liu Hui 13 Liu Hui was a famous mathematician in Wei and Jin Dynasties. He has made great achievements in mathematics and occupies an extremely important position in the field of mathematics. In a very humble environment, he thought hard and put forward one exciting theory after another. Next, let's look at the story about Liu Hui.
Liu Hui is a famous mathematician in the ancient history of China and even in the world. Through his own continuous research, he put forward the "cyclotomy" in a very simple environment, and then obtained a more accurate pi. This was a very great discovery at that time, which also made China's calculation of pi always in the leading position in the world.
Liu Hui put forward secant theory in his works, which can be used to calculate pi. In Chapter Nine Arithmetic, it is mentioned that "the diameter on Wednesday is one", which means that the approximate value of pi is three. But Liu Hui thinks this figure is too general and inaccurate. She points out that this figure cannot be used as pi. Later, in an accidental event, Liu Hui found that the more sides of a polygon in a circle, the closer the perimeter of the polygon is to the perimeter of the circle, which is the origin of secant technique. Using secant technique, Liu Hui cut from the regular hexagon in the circle, and then calculated the dodecagon until he calculated the 96 hexagon. The approximate value of pi that can be obtained is 3. 14。 However, Liu Hui is not satisfied with this. Later, he continued to calculate further and got the most accurate pi of 3 in the world at that time. 14 16。
Liu Hui is a great mathematician, and his achievements in mathematics have had a far-reaching impact on the development of mathematics in later generations.
Expansion: Liu Hui calculates classics on the island.
Liu Hui is a well-deserved master in mathematics. He transformed traditional mathematics with all kinds of excellent ideas, which made mathematics research step up to a new level. His mathematical works are precious to the mathematical community, and island computing is one of them.
In 263, Liu Hui wrote "Nine Chapters of Arithmetic Notes", of which "Archipelago Calculation" was the tenth volume. It was not until the Tang Dynasty that the Book of Islands Calculations began to appear as a work alone. This book is China's earliest surveying work, which deals with the problem of measuring height and distance. So some people say that it is the origin of trigonometry, but it does not involve related theories and knowledge points. There are nine questions about measuring height, depth and width in this book, all of which are measured from different positions with a ruler, and then the difference between these measured values is obtained, and then the height distance of the mountain is calculated through these differences. In these calculations, the method used is calculation. Because the first question is related to pirates, this book is named Island Calculation.
This book was published separately in the early Tang Dynasty and later included in the encyclopedic literature collection. Fortunately, after thousands of years of turmoil, this book has not disappeared in the long river of time, and now it is properly kept. Unfortunately, although this book was not lost, it was not kept in China, but in the library of Cambridge University in England.
It has been pointed out that China's geodesy reached its peak with the book Calculation Classics of Islands, and its geodesy was about 1400 years earlier than that of Europe, showing the advanced geodesy of ancient China.