Chen Jiangong

Chen Jiangong

Chen Jiangong (September 8, 1893 - April 11, 1971), born in Shaoxing, Zhejiang Province, is a mathematician and mathematical educator. He is one of the pioneers in the study of function theory in China. Professor of Fudan University and Hangzhou University.

Born on September 8, 1893 in Fucheng, Shaoxing, Zhejiang Province. In 1913 and 1920, Chen went to Japan to study. After returning to China in 1923, he taught in Zhejiang polytechnic school and national Wuchang University. In 1926, he went to Japan for the third time to study abroad. He studied trigonometric series theory deeply, especially function theory, and made a great breakthrough and remarkable achievement. He was elected academician of the Chinese Academy of Sciences in 1955. He died on April 11, 1971.

He has been engaged in mathematics education and research all his life. He has made great achievements in function theory, especially in trigonometric series. He founded the characteristic school of function theory (Chen Su school) and enjoys international reputation.

Chen Jiangong, mathematician. Born in Shaoxing, Zhejiang Province on September 8, 1893. He graduated from Tokyo Institute of technology in 1918 and Tokyo physics school the next year. He graduated from the Imperial University of northeast Japan in 1929. In 1955, he was elected member of the academic department of the Chinese Academy of Sciences. He died on April 11, 1971. He was professor of Zhejiang University, Professor of Fudan University, professor and vice president of Hangzhou University. He is the leader of Chinese functional theory and the pioneer of many branch research fields. In the 1920s, we solved the fundamental mathematical problems that functions can be expressed by trigonometric series with absolute convergence, and obtained the discriminant theory of unconditional convergence.

Life of the characters

On September 8, 1893, Chen Jiangong was born in Fucheng, Shaoxing City, Zhejiang Province.

In 1898, when he was five years old, he began to study in the private school next door. He was intelligent and studious. A few years later, he entered the famous Jishan Academy in Shaoxing.

In 1909, he was admitted to Shaoxing Fu middle school, where Mr. Lu Xun taught.

In 1910, he entered the Higher Normal School of Hangzhou. His favorite course of three years is mathematics.

After graduating in 1913, in order to enrich the country and strengthen the people with science, Chen Jiangong chose to go to Japan for further study.

In 1914, Chen Chien Kung got the official fee and was admitted to Tokyo Institute of technology to study dyeing technology. However, his interest in mathematics did not diminish, so he was admitted to Tokyo physics school, an evening school. So he studied chemical engineering in the daytime, mathematics and physics in the evening, and worked hard in the two schools day and night. In the past five years, he not only made great progress in his studies, laying a solid foundation for the future, but also developed the habit of cherishing time.

In 1918, he graduated from the higher industrial school, and the next spring he graduated from the physics school. Full of learning achievements, he returned to the motherland and taught in Zhejiang a industrial school. Although the teaching task is arduous, Chen Jiangong's interest in mathematics is increasing. Besides teaching, he studies mathematics and guides a mathematics interest group.

In 1920, Chen Jiangong went to Japan to study again. He bid farewell to his newly married wife Li Guoying (born in Ningbo, died of illness in 1930), came to Sendai, Japan, and was admitted to the Department of mathematics of northeastern Imperial University. Since then, he began to study modern mathematics.

In 1921, Chen Jiangong's first paper, sometheoremsoniniteproducts, was published in Northeast mathematics journal. This is one of the first mathematical papers published abroad by Chinese scholars.

In 1923, after graduating from northeast Imperial University, Chen Jiangong returned to China to teach in Zhejiang polytechnic school. The next year, he was employed as a professor in the Department of mathematics of national Wuchang University.

In 1926, Chen Jiangong went to the East for the third time, and was admitted to the Graduate School of northeast Imperial University to study for a doctor's degree. Under the guidance of his tutor, Mr. fujihara matsutaro, he specialized in the theory of trigonometric series. At that time, as the main part of Fourier analysis, the theory of trigonometric series was in its heyday in the world. Chen Jiangong has made many creative achievements in his research for more than two years.

In 1929, he received a rare doctorate of Science in Japan through his defense, which was the first foreign scholar to receive this honor in Japan. Japanese newspapers published the news on the first page. In order to thank his teacher for his teaching, Chen Jiangong, on the basis of his own research work, combined with the latest international achievements at that time, wrote a monograph on Trigonometric Series in Japanese, which was published by the famous Yanbo bookstore. The book is not only rich in content, but also listed as the reference of Japanese basic mathematics after decades.

In 1929, Chen Jiangong politely declined his tutor's offer to work in Japan. After returning to his homesick motherland, many universities scrambled to hire him. Shao Peizhi, President of Zhejiang University, invited him to be the head of the Department of mathematics.

In 1931, at the suggestion of Chen Jiangong, the president invited Su Buqing, the second Japanese doctor of Science in China, to be the head of the Department of mathematics. Since then, the two professors have worked closely for more than 20 years, trained a large number of talents for the country, and formed the internationally acclaimed "Zhejiang University School".

In 1937, after the outbreak of the Anti Japanese War, Zhejiang University started from Hangzhou and moved westward. After going through Jiande, Zhejiang Province, Ji'an, Taihe, Jiangxi Province, and Yishan, Guangxi Province, Zhejiang University traveled 5000 miles. In February 1940, Zhejiang University successively arrived in Zunyi and Meitan, Guizhou Province, and established the Engineering College of Zhejiang University and the Science College of Zhejiang University. Chen Jiangong sent his family to his hometown in Shaoxing. He went west with his school alone. Along the way, he was bombed by Japanese planes, and his life was extremely difficult. However, his mathematics research and teaching still continued. He said that "we will never stay in the enemy occupied areas" and "we must continue to run the mathematics department without interrupting it.".

In 1945, after the victory of the Anti Japanese War, Zhejiang University moved back to Hangzhou. Biologist Luo zongluo invited Chen Jiangong to take over Taiwan University. Before he left, Chen said to his colleagues, "we went on a temporary basis." In the spring of the next year, he resigned as acting president and provost of Taiwan University and returned to Zhejiang University as a professor. He was also a researcher at the Institute of mathematics of Academia Sinica, which was presided over by Professor Chen Shengshen at that time.

In 1947, he was invited to work as a researcher at the Princeton Institute. He was not moved by the superior scientific research conditions of the United States, and returned to Zhejiang University a year later. As soon as Hangzhou was liberated, Chen realized that academic exchanges with the Soviet Union would become more frequent. He took the lead in learning Russian that summer, and soon led his students to study Soviet mathematics. Just as he was trying his best to train the first batch of graduate students for new China, the Korean War broke out. In order to defend the motherland, he sent his son to join the army.

In 1952, the Faculty of Arts and science of Zhejiang University was merged into Fudan University, and professors such as Chen Jiangong and Su Buqing were transferred to Shanghai. Moreover, scientific research achievements and monographs were constantly published.

In May 1956, Chen Jiangong, Cheng minde and Wu Wenjun attended the Romanian Conference on "international function theory" on behalf of China.

In 1958, a new Hangzhou University was established in Zhejiang Province, and Chen Jiangong was invited to be vice president. At the request of Shanghai Science and Technology Publishing House, Chen Jiangong combined his decades of research achievements in trigonometric series with the highest international achievements, and wrote a great book on trigonometric series. The first volume of the book was published in December 1964. Just when Chen Jiangong sent out the manuscript of the second volume of the theory of trigonometric progression, the "Cultural Revolution" began, and experts and scholars were doomed.

In 1962, he attended the Guangzhou conference. When he heard that the leaders of the party and the state affirmed that he was not a bourgeois intellectual, he was very happy. He applied to join the Communist Party of China.

In 1963, the Party committee of Hangzhou university thought that he had a clean history and a strong sense of career, and that he should be recruited as a party member. The provincial Party committee also agreed. The next year, the Party branch meeting approved his application, and the Party committee at a higher level approved it. Later, it was shelved for some reason. However, as always, he devoted himself to training a new generation of mathematicians for the country.

At the beginning of 1971, Chen Jiangong's physical condition went from bad to worse, with severe gastric bleeding and complications of heart and lung.

At 20:28 on April 11, 1971, Professor Chen Jiangong died at the age of 78.

Main achievements

Achievements in scientific research

Research Review

He is the leader of Chinese functional theory and the pioneer of many branch research fields. In the 1920s, we solved the fundamental mathematical problems that functions can be expressed by trigonometric series with absolute convergence, and obtained the discriminant theory of unconditional convergence.

Academic works

Some problems of univalent function theory, geometric theory of complex variable function and complex variable function theory -- Soviet mathematics in the past 30 years were translated by Γ. M. goluzin.

On the basis of his years of research and teaching accumulation, his monographs sum of orthogonal function series, summary of the Fourier series of orthogonal functions and real function theory have been published one after another.

He has published more than 60 mathematical papers and 9 Monographs in academic journals at home and abroad

1·K·K·Chen，SomeTheoremsonInfiniteProducts，ThokuMath·J·，

Chinese PinYin : Chen Jian Gong