Kiyoshi Oka
Encyclopedia
was a Japan
ese mathematician
who did fundamental work in the theory of several complex variables
. He was born in Osaka
. He went to Kyoto Imperial University in 1919, turning to mathematics in 1923 and graduating in 1924.
He was in Paris
for three years from 1929, returning to Hiroshima University
. He published solutions to the first and second Cousin problems
, and work on domains of holomorphy
, in the period 1936–1940. These were later taken up by Henri Cartan
and his school, playing a basic role in the development of sheaf
theory. Oka continued to work in the field, and proved Oka's coherence theorem in 1950.
He was professor
at Nara Women's University
from 1949 to retirement at 1964. He received many honours in Japan.
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
ese mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....
who did fundamental work in the theory of several complex variables
Several complex variables
The theory of functions of several complex variables is the branch of mathematics dealing with functionson the space Cn of n-tuples of complex numbers...
. He was born in Osaka
Osaka
is a city in the Kansai region of Japan's main island of Honshu, a designated city under the Local Autonomy Law, the capital city of Osaka Prefecture and also the biggest part of Keihanshin area, which is represented by three major cities of Japan, Kyoto, Osaka and Kobe...
. He went to Kyoto Imperial University in 1919, turning to mathematics in 1923 and graduating in 1924.
He was in Paris
Paris
Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...
for three years from 1929, returning to Hiroshima University
Hiroshima University
, located in the Japanese cities of Higashihiroshima and Hiroshima, was established 1949 by the merger of a number of national educational institutions.-History:Under the National School Establishment Law, Hiroshima University was established on May 31, 1949...
. He published solutions to the first and second Cousin problems
Cousin problems
In mathematics, the Cousin problems are two questions in several complex variables, concerning the existence of meromorphic functions that are specified in terms of local data. They were introduced in special cases by P. Cousin in 1895...
, and work on domains of holomorphy
Domain of holomorphy
In mathematics, in the theory of functions of several complex variables, a domain of holomorphy is a set which is maximal in the sense that there exists a holomorphic function on this set which cannot be extended to a bigger set....
, in the period 1936–1940. These were later taken up by Henri Cartan
Henri Cartan
Henri Paul Cartan was a French mathematician with substantial contributions in algebraic topology. He was the son of the French mathematician Élie Cartan.-Life:...
and his school, playing a basic role in the development of sheaf
Sheaf (mathematics)
In mathematics, a sheaf is a tool for systematically tracking locally defined data attached to the open sets of a topological space. The data can be restricted to smaller open sets, and the data assigned to an open set is equivalent to all collections of compatible data assigned to collections of...
theory. Oka continued to work in the field, and proved Oka's coherence theorem in 1950.
He was professor
Professor
A professor is a scholarly teacher; the precise meaning of the term varies by country. Literally, professor derives from Latin as a "person who professes" being usually an expert in arts or sciences; a teacher of high rank...
at Nara Women's University
Nara Women's University
Nara Women's University , is one of two national women's universities in Japan, located in Nara. The other one is the Ochanomizu University.-Overview:...
from 1949 to retirement at 1964. He received many honours in Japan.
Published papers
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