Ideals Varieties and Algorithms : An Introduction to Computational Algebraic Geometry and Commutative Algebra This text covers topics in algebraic geometry and commutative algebra with a strong perspective toward practical and computational aspects. The first four chapters form the core of the book. A comprehensive chart in the preface illustrates a variety of ways to proceed with the material once these chapters are covered. In addition to the fundamentals of algebraic geometry the elimination theorem the extension theorem the closure theorem and the Nullstellensatz this new edition incorporates several substantial changes all of which are listed in the Preface. The largest revision incorporates a new chapter (ten) which presents some of the essentials of progress made over the last decades in computing Gröbner bases. The book also includes current computer algebra material in Appendix C and updated independent projects (Appendix D). The book may serve as a first or second course in undergraduate abstract algebra and with some supplementation perhaps for beginning graduate level courses in algebraic geometry or computational algebra. Prerequisites for the reader include linear algebra and a proof oriented course. It is assumed that the reader has access to a computer algebra system. Appendix C describes features of Maple™ Mathematica® and Sage as well as other systems that are most relevant to the text. Pseudocode is used in the text; Appendix B carefully describes the pseudocode used. From the reviews of previous editions: “…The book gives an introduction to Buchberger’s algorithm with applications to syzygies Hilbert polynomials primary decompositions. There is an introduction to classical algebraic geometry with applications to the ideal membership problem solving polynomial equations and elimination theory. …The book is well written. …The reviewer is sure that it will be an excellent guide to introduce further undergraduates in the algorithmic aspect of commutative algebra and algebraic geometry.” Peter Schenzel zbMATH 2007 “I consider the book to be wonderful. .. The exposition is very clear there are many helpful pictures and there are a great many instructive exercises some quite challenging .. offers the heart and soul of modern commutative and algebraic geometry.” The American Mathematical Monthly Preface Notation for Sets and Functions 1. Geometry Algebra and Algorithms 2. Groebner Bases 3. Elimination Theory 4.The Algebra Geometry Dictionary 5. Polynomial and Rational Functions on a Variety 6. Robotics and Automatic Geometric Theorem Proving 7. Invariant Theory of Finite Groups 8. Projective Algebraic Geometry 9. The Dimension of a Variety 10. Additional Groebner Basis Algorithms Appendix A. Some Concepts from Algebra Appendix B. Pseudocode Appendix C. Computer Algebra Systems Appendix D. Independent Projects References Index