1, introduction of Cheng Dawei:
One of Cheng Dawei's contributions to mathematics is to solve the multiplication problem by the method of summation of unary components.
He introduced this method of dividing an integer into multiple factors in his book Arithmetic Unity written in Ming Dynasty, and applied it to multiplication operation, which simplified the calculation process.
This method was later called "Cheng's algorithm" and was widely used in the field of mathematics education in China and Japan.
Cheng Dawei also introduced other mathematical methods, such as continued fraction method and radical method. These methods played an important role in ancient mathematics in China.
Cheng Dawei also popularized the use of abacus and compiled many mathematics books, which made important contributions to the development of ancient mathematics in China.
Cheng Dawei (1533 ~ 1606) was a businessman and inventor of abacus in Ming dynasty. The word Rusi, No.,Han nationality, is from Lingkou, Xiuning County, Huizhou Prefecture, South Zhili (now Tunxi, Huangshan City).
When I was a teenager, I read widely and was very interested in calligraphy and mathematics. I have never been an official in my life. He has been doing business in the middle and lower reaches of the Yangtze River since he was 20 years old.
Because of the need of business computing, he has been paying attention to mathematics, visiting famous teachers, collecting a large number of mathematics books, studying hard and sometimes gaining experience.
When he was about 40 years old, he went home, devoted himself to research, referred to various theories and supplemented his own opinions. At the age of 60, he completed his masterpiece "The Unification of Pointing Algorithms" (referred to as "Algorithm Unification").
As Joseph Needham in England said, "Cheng Dawei was the most striking mathematician in Ming Dynasty" and "There was no complete description of modern abacus before Cheng Dawei's Direct Arithmetic", which is the originator of integrated computing.