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, structure, space, models, and change. History On ...

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 (e.g. inner product, norm, topology, etc.) and the linear functions defined o ...

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

University of Tokyo , abbreviated as or UTokyo, is a public research university located in Bunkyō, Tokyo, Japan. Established in 1877, the university was the first Imperial University and is currently a Top Type university of the Top Global University Project b ...

, and held posts at

Osaka is a designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the third most populous city in Japan, following Special wards of Tokyo and Yokohama. With a population of ...

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 ...

, 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 University of Tokyo faculty Osaka University faculty Nagoya University faculty Laureates of the Imperial Prize {{asia-mathematician-stub

See also

References

External links