The 19th century witnessed substantial progress in various areas of mathematics, including:
(Lectures on the Development of Mathematics in the 19th Century) is one of the most influential historical accounts of modern mathematics. Published posthumously in 1926 and edited by Richard Courant and Otto Neugebauer, the work provides a unique "insider's view" of the era’s mathematical transformations, as Klein himself was a central figure in many of these developments. Core Themes and Structure development of mathematics in the 19th century klein pdf