| 1901 | OKA Kiyoshi was born in Osaka city on April 19, his father was Kanji and mother Yae. His family had been influential in Kimi village (Hashimoto city at present), Wakayama Prefecture. |
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| 1904 | He went back to Kimi village because his father Kanji went to the front. He passed much time with his grandfather Bun-ichiro. |
| 1907 | He entered Hashiramoto primary school. He changed to Kan-nan primary school in the second grade and changed to Hashiramoto again in the fifth grade. He was fond of collecting insects, and it gave him a great pleasure to find a rare one. |
| 1913 | He failed the entrance examination of a junior high school and went on to the upper primary school. In those days he read a lot of books. |
| 1914 | He entered Kokawa junior high school. Then he read Clifford's book,
Common Sence of the Exact Science. This was his first experience to
the deep mysteries of
mathematics. His grandfather Bun-ichiro died. |
| 1919 | He entered Kyoto Emperial University. He began to be interested in discoveries in mathematics when he read Poincaré book, Science et Méthode. |
| 1922 | He went on to the Department of Physics. The next year he changed to the Department of Mathematics. |
| 1925 | He graduated and was appointed lecturer of the university. In those days
Hideki YUKAWA(Physicist), Shin-ichiro TOMONAGA(Physicist) and Akira KOBORI(Mathematician,
theory of functions) were in the university as students. He married KOYAMA Michi. He began to study iterations of functions since he read Julia's papers, and he made several discoveries about them. |
| 1929 | He went to France. He visited frequently the library of Paris University and he decided to study the theory of analytic functions of several variables as the theme of his research. He discovered two mathematical results in France. |
| 1932 | In March he transferred to Hiroshima University. In May he came back to Japan. |
| 1933 | He wrote his results in France in a paper over 100 pages, which was not published. In the next year he published only the summary of this paper. |
| 1935 | He read Behnke and Thullen's book, Theorie der Funktionen mehrerer komplexen Veränderlichen. In this book they precisely described the progress of the field. He understood the importance of three unsolved problems mentioned there, and in January he began to study them. He discovered the first key Lifting Principle on August 29. |
| 1936 | In May he published the first paper Domaines convexes par rapport aux fonctions rationnelles. In December he published the second paper Domaines d'holomorphie. In these papers he solved the Cousin I problems and the development problems in the domain of holomorphy. |
| 1938 | In January he published the third paper Deuxième problème de Cousin. In this paper he treated Cousin II problem. He went back to Kimi village bacause of a disease. |
| 1939 | His father Kanji died. |
| 1940 | He published the fourth and the fifth paper Domaines d'holomorphie et domaines rationnellement convexes, L'intègrale de Cauchy, which had been already completed in 1937. He presented his results, from first to fifth paper, and he was granted the doctor's degree of Science in October. |
| 1941 | In October he published the sixth paper Domaines pseudoconvexes. In this paper he solved the inverse problem of Hartogs. |
| 1942 | He devoted himself to study in Kimi village during the shortage of World War II. He continued his research with the aid of Huju-kai and he published his results in the research reports of Huju-kai, which is contained in the collections of posthumous works. |
| 1948 | He asked Yukawa to hand his seventh paper Sur quelques notions arithmètiques to Cartan, on his way to be awarded the Nobel prize. The paper was published in Bulletin de la Societe Mathematique de France in 1950. In this paper he established the theory of the ideal of indeterminate domains. |
| 1949 | He was appointed as a professor of Nara Women's University. |
| 1951 | He published the eighth paper Lemme fondamental. He moved to Nara city. In May he was awarded the Japan Academy Prize. |
| 1953 |
He published the ninth paper Domaines finis sans point critique intèrieur. This was the compilation of his works, which had been already written in the research report of Huju-kai. |
| 1954 | In January he was awarded the Asahi Culture Prize. |
| 1960 | In November he was conferred the Cultural Medal. |
| 1961 | He received the title of honorary citizen of Hashimoto city. He was afraid of the present and the future of Japan in his later days, and he made lots of remarks about culture and education through his books and speeches. |
| 1962 | He published the tenth paper Une mode nouvelle engendrant les domaines pseudoconvexes, which was related to his research during his stay in France. |
| 1964 | In March he retired from Nara Women's University and was appointed Professor Emeritus of the university. |
| 1968 | He received the title of honorary citizen of Nara City. |
| 1969 | He was appointed professor of Kyoto Sangyo University. |
| 1978 | On March 1, he died. He was buried in Byakugo-ji temple, Nara city. On May 26 his wife Michi died. |