""A History Of The Progress On The Calculus Of Variations: During The Nineteenth Century"" is a book written by Isaac Todhunter and published in 1861. The book provides a comprehensive overview of the development of the calculus of variations during the 19th century. It discusses the major contributions made by mathematicians such as Lagrange, Euler, and Weierstrass, and how their work helped shape the field. The book also explores the application...