G.A. Bliss "Lectures on the Calculus of Variations''

The purposes of this book are two: first, the presentation of the notions and principles underlying modern theories of the calculus of variations in as simple, yet as inclusive, a form as possible; and second, the development, as completely as now possible, of the theory of one of the most comprehensive problems of the calculus of variations which have been formulated. The book is divided in two parts - Part I, "Simpler Problems of the Calculus of Variations", Part II "The Problem of Bolza."

Gilbert Ames Bliss Was Martin Ryerson Distinguished Professor of Mathematics, the University of Chicago.