Cover news reporter Yang Fan photography Chen Yuxiao
On October 18th, Cai Tianxin, a professor of mathematics, writer and traveler at Zhejiang University, made a guest appearance at the "Celebrity Lecture Hall" and gave a lecture at the Sichuan Provincial Library with the title of "Qin Jiushao, Daoguqiao and China's Residual Theorem". On the day of the speech, the special training course on the inheritance and development of Ba culture in Dazhou City was opened at the Sichuan Provincial Cadre Correspondence College, and 55 trainees then came to the Celebrity Lecture Hall to listen to Professor Cai Tianxin's lecture, and they had a deeper understanding of Qin Jiushao, a great mathematician of the Southern Song Dynasty.
The Southern Song Dynasty mathematician Qin Jiushao was born in Puzhou (present-day Anyue County, Ziyang City, Sichuan) in 1208, and studied astrology, musical rhythm, arithmetic, and construction, and wrote the "Nine Chapters of the Book of Numbers", which was included in the "Yongle Canon" and the "Outline of the General Catalogue of the Four Libraries". Many of these calculation methods and empirical constants still have high reference value and practical significance, known as the "treasure book in arithmetic", representing the advanced level of Chinese mathematics at that time and occupying a lofty position in the history of world mathematics.
Qin Jiushao founded the quite complete "Great Yan Qiu Yi Technique" and "Positive and Negative Prescription Technique" in the "Nine Chapters of the Book of Numbers", which is an outstanding summary of the brilliant achievements of traditional Chinese mathematics in these two aspects. The "Great Yan Qiu Yi Shu" is more than 500 years earlier than the research of the famous Western mathematicians Euler and Gauss on this problem, and is called "China's residual theorem" by the West, showing Qin Jiushao's lofty position in the history of world mathematics.
Before this lecture, many people had heard of the name Qin Jiushao, but knew very little about his deeds and achievements. Through Professor Cai Tianxin's explanation, many viewers not only learned that Qin Jiushao was an outstanding mathematical genius, but also a writer and astronomer, and even learned about the "brief history" of ancient Chinese mathematics, which benefited them a lot.
Wang Mi from Xuanhan County, Sichuan Province, said: "Tonight I was very honored to listen to Professor Cai Tianxin's wonderful explanation of Qin Jiushao, Daoguqiao and the remaining theorems of China in the 'Hall of Fame', which made us feel the greatness and wonder of Chinese mathematics again, and also made us more firm in China's cultural self-confidence. Thank you Professor Cai for your wonderful lectures, and thank you to the Hall of Fame for giving us this opportunity to learn. ”
Li Yu, who is studying at the Sichuan Provincial Cadre Correspondence College, told the cover news reporter: "Mathematics is very interesting and wonderful. Teacher Cai, the keynote speaker, has feelings, has made unremitting efforts to seek truth, and has been constantly striving to enhance China's influence. This can be seen from the fact that he wanted to rename the 'Chinese surplus theorem' to 'Qin Jiushao's theorem'. ”
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