The story of Liu Hui's famous mathematician 1 Liu Hui (born around 250 AD) is a very great mathematician in the history of Chinese mathematics and occupies a prominent position in the history of world mathematics. His representative works "Nine Arithmetic Notes" and "Arithmetic Classics on the Island" are the most precious mathematical heritages in China.
Nine Chapters of Arithmetic was written in the early Eastern Han Dynasty, with 246 solutions. It is advanced in the world in solving simultaneous equations, calculating four fractions, calculating positive and negative numbers, calculating the volume and area of geometric figures and many other aspects. However, due to the original solution, they lacked the necessary proof, and Liu Hui made supplementary proof. In these proofs, his creative contributions in many aspects are shown. He was the first person in the world to put forward the concept of decimal, and used decimal to represent the cube root of irrational numbers. In algebra, he correctly put forward the concept of positive and negative numbers and the rules of addition and subtraction; The solution of linear equations is improved. In geometry, "secant" is put forward, that is, the method of finding the area and perimeter of a circle by using inscribed or circumscribed regular polygons to exhaust the circumference. He scientifically obtained the result that pi = 3. 14 by using secant technology. Liu Hui's theory "carefully cut the circle and lose little;" Cut hard, can't cut, through, don't lose anything "can be regarded as the representative work of China's ancient limit concept.
In the book Island Calculation, Liu Hui carefully selected nine survey questions. The creativity, complexity and representativeness of these topics attracted the attention of the west at that time.
Liu Hui has quick thinking and flexible methods. He advocates reasoning and intuition. He was the first person in China who explicitly advocated using logical reasoning to demonstrate mathematical propositions.
Liu Hui's life is a life of hard exploration of mathematics. Although his position is low, his personality is noble. He is not a mediocre man who seeks fame and fame, but a great man who never tires of learning. He left us a valuable fortune.
One day, Liu Hui happened to see a stonemason cutting stones. It looks interesting, so just stand aside and observe it carefully.
Liu Hui saw that a square stone was first cut off by a stonemason, and the stone with four corners had eight corners in an instant, and then the eight corners were cut off, and so on. The stonemason kept cutting off these corners one by one until there were no corners to cut. In the end, Liu Hui found that the square stone had become a smooth pillar unconsciously.
Masons are polishing stones every day, but it is such a trivial matter that Liu Hui suddenly saw something that others didn't see. Like a stonemason, Liu Hui kept dividing the circle and finally invented the "tangent circle".
Inspired by the accident, Liu Hui thought of the calculation method of pi, and then invented the secant method, which provided a set of rigorous theory and perfect algorithm for the calculation of pi.
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Liu Hui's life:
Liu Hui (about 225-295), a native of Zouping City, Binzhou, Shandong Province [1], was a great mathematician in Wei and Jin Dynasties and one of the founders of China's classical mathematical theory. He is a very great mathematician in the history of Chinese mathematics. His representative works "Nine Arithmetic Notes" and "Arithmetic on the Island" are China's most precious mathematical heritage.
Liu Hui has quick thinking and flexible methods. He advocates reasoning and intuition. He was the first person in China who explicitly advocated using logical reasoning to demonstrate mathematical propositions. Liu Hui's life is a life of hard exploration of mathematics. Although his position is low, his personality is noble. He is not a mediocre man who seeks fame and fame, but a great man who never tires of learning. He left us a valuable fortune.