- 2022 Oscar Zariski.
- 2022 Frank Josellis.
- 2022 Ernst Stueckelberg.
- 2022 Bob Kaplan.
- 2018: Something about Khipu.
- 2018: George Green, his achievements and place in science (book of 1976).
- 2018: Hassler Whitney in the alps (photo of George de Rham).
- 2017: Komaravolu Chandrasekharan (1920-2017).
- 2014: About the literature of descriptive geometry.
- 2014: Notes including some history of calculus books.
- 2013: About Oscar Lanford, 1940-2013.
- 2013: About the culture of mathematical exhibits.
- 2013: Thinking like Archimedes with a 3D printer
- 2011: Some scanned Ahlfors documents from my old office 432, which was Ahlfors office.
- 2005-2013: About the Chinese Remainder theorem
- 2007: To the 300th Birthday of Leonhard Euler
- 2007: Bibliographical entries of Jost Bürgi, Max Wolf, Arthur Schuster and Fritz Zwicky in BEA, Springer, 2007, Editor-in-Chief: Thomas Hockey. Here are the proof versions of my contributions: Buergi [PDF] with more references and sources, Schuster [PDF] Wolf [PDF] and Zwicky [PDF]. The articles are on Springer.
- 2002: On Harvard Calculus.
- 1999: About Juergen Moser 1928-1999.
- 1998: To the 100'th birthday of Fritz Zwicky.
- 1993: Photo of Hillerod conference.
- Some notes in Giaquinta-Hildebrandt 1996 on Lagrange.
- About matrix multiplication invented? (see also
my article on Cauchy-Binet).