Zeng Jiongzhi

Zeng Jiongzhi ( Chinese  曾 炯 之 , Pinyin Zēng Jiǒngzhī ), English transcription also Chiungtze Chiung Tsen (born April 2, 1898 in Xinjian County, Nanchang City , Chinese Empire ; † October 1, 1940 in Xichang , Republic of China ), was a Chinese Mathematician who studied algebra.

Zeng, the son of poor fishermen, began his studies in China at the age of 24 at Wuchang Senior Normal College , where one of his teachers was the analyst Kien-Kwong Chen (1893–1971) and where he graduated in 1926. He then taught as a teacher and at the end of 1928 went to Germany on a scholarship from the Chinese government (first to study languages ​​at the University of Berlin), and from 1929 to the University of Göttingen . He received his doctorate in 1934 in Göttingen with Emmy Noether (at that time no longer in Göttingen, but she assessed the work by letter) and Friedrich Karl Schmidt (algebras on function fields). In his dissertation he introduced the idea of ​​quasi-algebraically closed bodies and proved a theorem named after him that function bodies of an algebraic curve are quasi-algebraically closed over an algebraically closed body. It follows from this that the brewer's group of this function field is trivial in a variable over an algebraically closed field (there is no non-trivial central simple division algebra over this function field). The concept of Quasi-Algebraic Completed was rediscovered in 1951 by Serge Lang (in his dissertation at Princeton). Zeng belonged to Ernst Witt's circle in Göttingen and was friends with him.

In 1934 a study completed at the University of Hamburg with Emil Artin , where he also friendship with SS Chern concluded. From July 1935 he was back in China. His only other publication besides the mentioned work from 1933 and his dissertation was On the step theory of the quasi-algebraic closure of commutative bodies in the short-lived Journal of the Chinese Mathematical Society (Volume 1, 1936, pp. 81-92), which was based on work in Hamburg and was dedicated to Emmy Noether, who had recently died. In 1937 he became a professor at Tianjin University (then Peiyang University), which was evacuated to Xi'an shortly after the outbreak of the Sino-Japanese War and then to other cities. Among other things, he gave algebra courses based on van der Waerden's well-known textbook. After all, he was a professor at the Northwestern Institute of Technology in Chenggu . In 1939 he went to the newly established National Xikang Institute of Technology in Xichang at the invitation of its President Li Xutien, who was previously President of Peiyang University. His wife suffered a miscarriage on the arduous journey there, and living conditions in Xichang were also very poor. He died there on October 1, 1940 of a stomach ulcer.

He had been married since 1937.

literature

• Sh. Ding, M. Kang, E.-Tj. Tan Chiungtze C. Tsen (1898-1940) and Tsen's Theorems , Rocky Mountain Journal of Mathematics, Volume 29, pp. 1237-1269, online

Individual evidence

1. ^ Mathematics Genealogy Project . A publication on this ( division algebras over function fields ) appeared in 1933 in the news of the Ges. Der Wiss. zu Göttingen, p. 335, online
2. ↑ In these, every non-constant homogeneous polynomial of degree d in N variables with d <N has a zero. One also speaks of bodies and of , if this applies to the inequality . ${\displaystyle C_{1}}$ ${\displaystyle C_{k}}$ ${\displaystyle d^{k}<N}$
3. ^ Lang Annals of Mathematics, Volume 55, 1952, p. 373

Note: This article places the family name before the person's first name. This is the usual order in Chinese. Zeng is the family name here, Jiongzhi is the first name.