Reflections on the Importance of the Leonhardi Euleri Opera Omnia, Volume IV A (2016) and Volume VIII (2018)

The article is devoted to two volumes of Leonhard Euler’s correspondence with mathematicians and other scientists. The first of these volumes (in two parts) is devoted to correspondence with Christian Goldbach. We consider selected topics from this correspondence reflecting various branches of mathematics and demonstrate, where possible, the connection of the ideas and results presented there with modern mathematical research. The second of these two volumes contains Euler’s correspondence with scholars associated with the University of Halle. These letters, with a small exception, have less mathematical content, but allow to create an impression of academic life at that time.