Kôsaku Yosida (or Yoshida), Japanese mathematician born in 1909, worked in the field of functional analysis. Yoshida (吉田, lucky/joyful ricefield) is the 12th most common Japanese surname. ... The Japanese (日本人, Nihon-jin) are the native people of the Japanese Archipelago. ... A mathematician is a person whose area of study and research is mathematics. ... Functional analysis is that branch of mathematics and specifically of analysis which is concerned with the study of spaces of functions. ...

He is known for the Hille-Yoshida theorem concerning C₀-semigroups. In mathematics, a semigroup is a set with an associative binary operation on it. ...

See also

• Einar Carl Hille
• Functional analysis
• Schrödinger semigroups

Einar Carl Hille (birth name Carl Einar Heuman) was an American mathematician, born 28 June 1894 in New York, USA, and died 12 February 1980 in La Jolla, California. ... Functional analysis is that branch of mathematics and specifically of analysis which is concerned with the study of spaces of functions. ...

References

• Kôsaku Yosida: Functional analysis. Grundlehren der mathematischen Wissenschaften 123, Springer-Verlag, 1971 (3rd ed.), 1974 (4th ed.), 1978 (5th ed.), 1980 (6th ed.)