Mathematics in Leeuwenhoeck's letters

Dutch title: Wiskunde in Leeuwenhoeck's brieven.

Text of the article in the original Dutch and in English translation from Alle de Brieven / The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren.

The following summary of things mathematical in Leeuwenhoeck's letters is divided into three parts:

A. Mathematical terms used.
B. Mathematical theorems applied.
C. Calculations performed.