In his "Island Calculation", he put forward the repeated difference technique, and used repeated tables, continuous cables, cumulative moments and other methods to measure the height and distance. He also developed gravity difference technology from two observations to three observations and four observations by analogy. In the 7th century, India and Europe only began to study the problem of two observations in15 ~16th century.
Liu Hui's work not only had a far-reaching impact on the development of ancient mathematics in China, but also laid a lofty historical position in the history of mathematics in the world. In view of Liu Hui's great contribution, many books call him "Newton in the history of Chinese mathematics".
2. Li Shizhen
On the day when Li Shizhen was born, his father Li Yanwen was fishing in Yuhu. Usually, he is lucky, but this time, he got nothing from several nets, and Li Yanwen was very depressed. The last net felt heavy when pulled up, and my heart exulted. I thought it was a big fish, but it turned out to be a big stone Li Yanwen sighed: Stone, stone, I have nothing against you. Why did you play tricks on me today? This makes me more worried. Stone suddenly spoke: stone, stone, don't worry if you come to congratulate.
My husband and wife are about to fall into the moon. What do you want? So this stone is the Rain Lake God. Li Yanwen arrived home just in time for Li Shizhen to give birth, so she named him Shizhen. That night, Li Yanwen had another dream that Tie Guai Li, a fairy, came to congratulate him and said, "When you are precious, you can diagnose all diseases. Be my apprentice and spread my reputation. "
3. Zhang Heng
The Book of Famous Paintings in Past Dynasties records a legend about Zhang Heng painting monsters with his toes: Zhang Heng heard that there was a monster bowing his head in the water of Pucheng, Jianzhou, and went to paint. But the monster didn't come out because he was afraid of being painted. Zhang Heng threw away the pen and paper, and the monster came out. He quietly drew the shape of a monster with his toes. It is a legend to be able to sketch with toes, but it can also be seen that Zhang Heng's painting name was not low at that time.
4. Zu Chongzhi
In Zu Chongzhi's time, abacus did not appear, and the commonly used calculation tool was called calculation. It is a square or flat stick several inches long, made of bamboo, wood, iron, jade and other materials. Through different arrangements of calculation and financing, various figures are expressed, which is called financing algorithm. If there are more digits, the larger the area needs to be placed.
Computing with a chip is not like using a pen, it can be left on paper, and every time it is calculated, it must be re-calculated. You can only write down the calculation results with notes, and you can't get more intuitive graphics and formulas.
So as long as there are errors, such as calculation errors or calculation errors, we can only start from scratch. In order to get the accurate value of pi, Zu Chongzhi needs to calculate the decimal of nine significant figures, including more than ten steps of addition, subtraction, multiplication, division and square root operation, and each step has to be repeated for more than ten times and 50 times of square root operation, and finally the calculated number reaches 16 or 17 digits after the decimal point.
5. Luban
The carpenter's granddaddy is Lu Ban, who has exquisite craftsmanship and is very clever. Legend has it that he once made a bird out of wood and flew in the sky for three days and nights without coming down. But even such a master sometimes has wrong ideas. Luban recruited many apprentices. In order to maintain the reputation of Banmen, he regularly checks and eliminates some people. One of them is Mount Tai, which looks silly. After coming for a while, his skills didn't improve, so Lu Ban kicked him out of the house.
A few years later, Lu Ban wandered in the street and suddenly found many well-made furniture, which was very popular with people. Luban wants to know who this man is. He was so powerful that someone said to him, "It's your apprentice Taishan." Lu Ban couldn't help but sigh with emotion: "I really don't know Mount Tai!"