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Books about Nakasawa:
A Lost Mathematician, Takeo Nakasawa: The Forgotten Father of Matroid Theory by Hirokazu Nishimura and Susumu Kuroda (Feb 27, 2009)
The chemistry of copper smelting in Japan: By I. Nakasawa by Iwata Nakasawa (1879)
Wiki information Nakasawa:
Nakasawa Station is a railway station on the JR East Tsugaru Line located in the city of Aomori, Aomori Prefecture, Japan. It is 16.8 rail kilometers from the southern terminus of the Tsugaru Line at Aomori Station. The station is on the border...
Takeo Nakasawa was a Japanese mathematician who independently invented the theory of matroids, though his work was forgotten for many years.