The theory of symmetric functions is an old topic in mathematics which is used as an algebraic tool in many classical fields. With \(\lambda\)rings, one can regard symmetric functions as operators on polynomials and reduce the theory to just a handful of fundamental formulas. One of the main goals of the book is to describe the technique of \(\lambda\)rings. The main applications of this technique to the theory of symmetric functions are related to the Euclid algorithm and its occurrence in division, continued fractions, Padé approximants, and orthogonal polynomials. Putting the emphasis on the symmetric group instead of symmetric functions, one can extend the theory to nonsymmetric polynomials, with Schur functions being replaced by Schubert polynomials. In two independent chapters, the author describes the main properties of these polynomials, following either the approach of Newton and interpolation methods or the method of Cauchy. The last chapter sketches a noncommutative version of symmetric functions, using Young tableaux and the plactic monoid. The book contains numerous exercises clarifying and extending many points of the main text. It will make an excellent supplementary text for a graduate course in combinatorics. Readership Graduate students and research mathematicians interested in combinatorics. Reviews "There is a wealth of information in this book, as well an extensive bibliography and an abundance of exercises (with solutions!) for conscientious reader."  Australian Mathematical Society Gazette "There is much to recommend about this book ... this book is an extensive treatise on symmetric functions and their role in many classical constructions in mathematics involv~ng polynomials, by a modern master of the subject."  Frank Sottile for Mathematical Reviews Table of Contents  Symmetric functions
 Symmetric functions as operators and \(\lambda\)rings
 Euclidean division
 Reciprocal differences and continued fractions
 Division, encore
 Padé approximants
 Symmetrizing operators
 Orthogonal polynomials
 Schubert polynomials
 The ring of polynomials as a module over symmetric ones
 The plactic algebra
 Complements
 Solutions of exercises
 Bibliography
 Index
