Understanding the Group Concept Introduction to Groups Modular Arithmetic Prime Factorizations The Definition of a Group The Structure within a Group Generators of Groups Defining Finite Groups in Mathematicaand GAP Subgroups Patterns within the Cosets of Groups Left and Right Cosets How to Write a Secret Message Normal Subgroups Quotient Groups Mappings between Groups Isomorphisms Homomorphisms The Three Isomorphism Theorems Permutation Groups Symmetric Groups Cycles Cayley's Theorem Numbering the Permutations Building Larger Groups from Smaller Groups The Direct Product The Fundamental Theorem of Finite Abelian Groups Automorphisms Semi-Direct Products The Search for Normal Subgroups The Center of a Group The Normalizer and Normal Closure Subgroups Conjugacy Classes and Simple Groups The Class Equation and Sylow's Theorems Solvable and Insoluble Groups Subnormal Series and the Jordan-Hölder Theorem Derived Group Series Polycyclic Groups Solving the Pyraminx(tm) Introduction to Rings Groups with an Additional Operation The Definition of a Ring Entering Finite Rings into GAP and Mathematica Some Properties of Rings The Structure within Rings Subrings Quotient Rings and Ideals Ring Isomorphisms Homomorphisms and Kernels Integral Domains and Fields Polynomial Rings The Field of Quotients Complex Numbers Ordered Commutative Rings Unique Factorization Factorization of Polynomials Unique Factorization Domains Principal Ideal Domains Euclidean Domains Finite Division Rings Entering Finite Fields inMathematicaor GAP Properties of Finite Fields Cyclotomic Polynomials Finite Skew Fields The Theory of Fields Vector Spaces Extension Fields Splitting Fields Galois Theory The Galois Group of an Extension Field The Galois Group of a Polynomial in Q The Fundamental Theorem of Galois Theory Solutions of Polynomial Equations Using Radicals Bibliography Answers to Odd Problems Index Problems appear at the end of each chapter.