""Biorthogonal Systems of Functions; Application of Biorthogonal Systems of Functions to the Theory of Integral Equations"" is a book written by Anna Johnson Pell and published in 1911. The book is divided into two parts, the first of which explores biorthogonal systems of functions. A biorthogonal system of functions is a set of functions that are both orthogonal and biorthogonal. The book explains the properties and applications of biorthogonal systems of functions in detail.The second part of the book delves into the application of biorthogonal systems of functions to the theory of integral equations. An integral equation is an equation in which an unknown function appears under an integral sign. The book discusses the use of biorthogonal systems of functions in solving integral equations and provides numerous examples and applications.Overall, ""Biorthogonal Systems of Functions; Application of Biorthogonal Systems of Functions to the Theory of Integral Equations"" is a comprehensive guide to biorthogonal systems of functions and their applications in the theory of integral equations. It is a valuable resource for students and researchers in mathematics and engineering.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.