Takeo Nakasawa (Japanese: 中澤武雄, February 5, 1913, Kōchi prefecture, Japan – June 20, 1946, Khabarovsk, Soviet Union) was a Japanese mathematician who independently invented the theory of matroids, though his work was forgotten for many years. He published four papers (in German) of which the first three introduce the subject of matroid theory during 1935–1938, when he worked as an assistant in the Tokyo University of Arts and Sciences (now University of Tsukuba). After his last paper was published, he left for Manchuria at the age of 25 in 1938, then ruled by Japan, and worked as a bureaucrat there. With the defeat of Japan in 1945, the Soviets took control of Manchuria and Nakasawa was carted off to Siberia. He died of dystrophia at the age of 33 in Khabarovsk in the Soviet Union in 1946.
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| - Takeo Nakasawa (de)
- 中澤武雄 (ja)
- Takeo Nakasawa (en)
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| - Takeo Nakasawa (Japanese: 中澤武雄, February 5, 1913, Kōchi prefecture, Japan – June 20, 1946, Khabarovsk, Soviet Union) was a Japanese mathematician who independently invented the theory of matroids, though his work was forgotten for many years. He published four papers (in German) of which the first three introduce the subject of matroid theory during 1935–1938, when he worked as an assistant in the Tokyo University of Arts and Sciences (now University of Tsukuba). After his last paper was published, he left for Manchuria at the age of 25 in 1938, then ruled by Japan, and worked as a bureaucrat there. With the defeat of Japan in 1945, the Soviets took control of Manchuria and Nakasawa was carted off to Siberia. He died of dystrophia at the age of 33 in Khabarovsk in the Soviet Union in 1946. (en)
- 中澤 武雄（なかさわ たけお 、1913年2月5日 - 1946年6月20日）は、マトロイド理論を独自に発明した日本の数学者。 (ja)
- Takeo Nakasawa (中澤武雄, * 5. Februar 1913 in der Präfektur Kōchi; † 20. Juni 1946 in Khabarovsk) war ein japanischer Mathematiker. Er gilt als einer der Väter der Theorie der Matroide (neben Hassler Whitney). (de)
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| - Takeo Nakasawa (中澤武雄, * 5. Februar 1913 in der Präfektur Kōchi; † 20. Juni 1946 in Khabarovsk) war ein japanischer Mathematiker. Er gilt als einer der Väter der Theorie der Matroide (neben Hassler Whitney). Nakasawa wurde als Takeo Sogabe geboren und 1924 von der Nakasawa Familie adoptiert. Er studierte Mathematik an der (der späteren – nach dem Zweiten Weltkrieg – , deren Nachfolger wiederum ab den 1970er Jahren die Universität Tsukuba war) mit dem Abschluss 1935 (sein Lehrer war Koshiro Nakamura) und war dort bis zur Entlassung im August 1938 Assistent. Danach endete seine Karriere als Mathematiker und er zog in die neu eroberte Mandschurei, wo er in der Verwaltung war. Er heiratete 1939 und hatte drei Kinder. Nach der russischen Besetzung wurde er zur Zwangsarbeit nach Sibirien verschleppt, wo er an Mangelernährung und Entkräftung in einem Hospital starb. Er veröffentlichte nur vier mathematische Arbeiten in den Jahren 1935 bis 1938, alle in Deutsch im Bulletin of the Tokyo University of Arts and Sciences. Drei davon befassten sich mit dem, was später Matroide bezeichnet wurde, die vierte mit allgemeiner Topologie. Sein Beitrag zur Theorie der Matroide wurde erst in den 1980er Jahren wiederentdeckt (durch Joseph P. S. Kung) und seine Biographie erst mit der Veröffentlichung eines Sammelbandes über ihn 2008 bekannt. (de)
- Takeo Nakasawa (Japanese: 中澤武雄, February 5, 1913, Kōchi prefecture, Japan – June 20, 1946, Khabarovsk, Soviet Union) was a Japanese mathematician who independently invented the theory of matroids, though his work was forgotten for many years. He published four papers (in German) of which the first three introduce the subject of matroid theory during 1935–1938, when he worked as an assistant in the Tokyo University of Arts and Sciences (now University of Tsukuba). After his last paper was published, he left for Manchuria at the age of 25 in 1938, then ruled by Japan, and worked as a bureaucrat there. With the defeat of Japan in 1945, the Soviets took control of Manchuria and Nakasawa was carted off to Siberia. He died of dystrophia at the age of 33 in Khabarovsk in the Soviet Union in 1946. (en)
- 中澤 武雄（なかさわ たけお 、1913年2月5日 - 1946年6月20日）は、マトロイド理論を独自に発明した日本の数学者。 (ja)
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