A new book chapter by DIJ researcher Harald Kümmerle analyzes the structure, reception, and production of mathematical knowledge in the early 1930s. Based on a case study of the history of a paper on duality written by the Japanese mathematician Tannaka Tadao in 1938, the chapter provides insights into the development of Tannaka’s research and into processes of cooperative knowledge production, including influences from and exchanges with mathematical communities in Japan and abroad. „Tannaka Tadao‘s 1938 paper on the duality of noncommutative topological groups and its historical background“ is published in Duality in 19th and 20th Century Mathematical Thinking (Science Networks. Historical Studies series, vol 63. Cham: Birkhäuser 2024), edited by Ralf Krömer and Emmylou Haffner.