Kosaku Yosida, born on February 7, 1909, was brought up in Tokyo. Having majored in Mathematics at University of Tokyo, he was appointed to Assistant at Osaka University in 1933 and promoted to Associate Professor in 1934. He re� ceived the title of Doctor of Science from Osaka University in 1939. In 1942 he was appointed to Professor at Nagoya University, where he worked very hard with his colleagues to promote and expand the newly established Department of Mathe� matics. He was appointed to Professor at Osaka University in 1953 and then to Professor at University of Tokyo in 1955. After retiring from University of Tokyo in 1969, he was appointed to Professor at Kyoto University, where he also acted as Director of the Research Institute for Mathematical Sciences. He retired from Kyoto University in 1972 and worked as Professor at Gakushuin University until 1979. Yosida acted as President of the Mathematical Society of Japan, as Member of the Science Council of Japan, and as Member of the Executive Committee of the International Mathematical Union. In 1967 he received the Japan Academy Prize and the Imperial Prize for his famous work on the theory of semigroups and its applications. In 1971 he was elected Member of the Japan Academy. Yosida went abroad many times to give series of lectures at mathematical in� stitutions and to deliver invited lectures at international mathematical symposia.

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K�saku Yosida is world famous as the founder, together with Einar Hille, of the theory of semigroups. These collected papers provide valuable information on how he started and developed functional analysis and operator theoretical methods in the theory of differential equations and probability theory. The book is divided into 10 sections following the main topics on which Yosida worked. Each section includes comments by a specialist of the fields for the benefit of the reader. An extensive bibliography of all Yosida's papers, both English and Japanese, is included. This edition will prove invaluable to anyone wanting a comprehensive view of Yosida's work.

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