was a

Japanese Japanese may refer to: * Something from or related to Japan, an island country in East Asia * Japanese language, spoken mainly in Japan * Japanese people, the ethnic group that identifies with Japan through ancestry or culture ** Japanese diaspor ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

who worked in the field of

functional analysis Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (for example, Inner product space#Definition, inner product, Norm (mathematics ...

. He is known for the Hille-Yosida theorem concerning ''C₀''-semigroups. Yosida studied mathematics at the

University of Tokyo The University of Tokyo (, abbreviated as in Japanese and UTokyo in English) is a public research university in Bunkyō, Tokyo, Japan. Founded in 1877 as the nation's first modern university by the merger of several pre-westernisation era ins ...

, and held posts at

Osaka is a Cities designated by government ordinance of Japan, designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the List of cities in Japan, third-most populous city in J ...

and Nagoya Universities. In 1955, Yosida returned to the University of Tokyo.

References

* Kôsaku Yosida: Functional analysis. Grundlehren der mathematischen Wissenschaften 123,

Springer-Verlag Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in ...

, 1971 (3rd ed.), 1974 (4th ed.), 1978 (5th ed.), 1980 (6th ed.)

External links

Photo

Kosaku Yosida / School of Mathematics and Statistics University of St Andrews, Scotland

94. Normed Rings and Spectral Theorems, II. By Kôsaku YOSIDA. Mathematical Inlstitute, Nagoya Imperial University. (Comm. by T.TAKAGMI, M.I.A. Oct.12,1943.)
*
Kosaku Yosida (1909 - 1990) - Biography - MacTutor
1909 births 1990 deaths 20th-century Japanese mathematicians Mathematical analysts Functional analysts Operator theorists Approximation theorists University of Tokyo alumni Academic staff of the University of Tokyo Academic staff of Osaka University Academic staff of Nagoya University Laureates of the Imperial Prize Scientists from Hiroshima {{asia-mathematician-stub

See also

References

External links