Detlef Laugwitz (1932-2000) was a mathematician and historian of mathematics. He authored a series of publications in professional history of mathematics journals on both Euler and Cauchy. See
Laugwitz, D. (1989). "Definite values of infinite sums: aspects of the foundations of infinitesimal analysis around 1820", Archive for History of Exact Sciences, 39 (3): 195–245. https://link.springer.com/article/10.1007/BF00329867
See also
Formalism versus Platonism
Cavalieri
Fermat
Leibniz
Euler
Cauchy
Riemann
Cantor
Klein
Skolem
Heyting
Robinson
Nelson
Hrbacek
Keisler
Kanovei
Infinitesimal topics
More on infinitesimals
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