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| Preface | p. xi |
| Integers and Equivalence Relations | p. 1 |
| Preliminaries | p. 3 |
| Properties of Integers | p. 3 |
| Modular Arithmetic | p. 6 |
| Complex Numbers | p. 13 |
| Mathematical Induction | p. 14 |
| Equivalence Relations | p. 17 |
| Functions (Mappings) | p. 20 |
| Exercises | p. 23 |
| Groups | p. 29 |
| ... MORE | p. 31 |
| Symmetries of a Square | p. 31 |
| The Dihedral Groups | p. 34 |
| Exercises | p. 37 |
| Biography of Niels Abel | p. 41 |
| Groups | p. 42 |
| Definition and Examples of Groups | p. 42 |
| Elementary Properties of Groups | p. 50 |
| Historical Note | p. 53 |
| Exercises | p. 54 |
| Finite Groups; Subgroups | p. 60 |
| Terminology and Notation | p. 60 |
| Subgroup Tests | p. 61 |
| Examples of Subgroups | p. 65 |
| Exercises | p. 68 |
| Cyclic Groups | p. 77 |
| Properties of Cyclic Groups | p. 77 |
| Classification of Subgroups of Cyclic Groups | p. 82 |
| Exercises | p. 87 |
| Biography of James Joseph Sylvester | p. 93 |
| Supplementary Exercises for Chapters 1-4 | p. 95 |
| Permutation Groups | p. 99 |
| Definition and Notation | p. 99 |
| Cycle Notation | p. 102 |
| Properties of Permutations | p. 104 |
| A Check-Digit Scheme Based on D5 | p. 115 |
| Exercises | p. 118 |
| Biography of Augustin Cauchy | p. 126 |
| Isomorphisms | p. 127 |
| Motivation | p. 127 |
| Definition and Examples | p. 127 |
| Cayley's Theorem | p. 131 |
| Properties of Isomorphisms | p. 133 |
| Automorphisms | p. 134 |
| Exercises | p. 138 |
| Biography of Arthur Cayley | p. 143 |
| Cosets and Lagrange's Theorem | p. 144 |
| Properties of Cosets | p. 144 |
| Lagrange's Theorem and Consequences | p. 147 |
| An Application of Cosets to Permutation Groups | p. 151 |
| The Rotation Group of a Cube and a Soccer Ball | p. 153 |
| An Application of Cosets to the Rubik's Cube | p. 155 |
| Exercises | p. 156 |
| Biography of Joseph Lagrange | p. 161 |
| External Direct Products | p. 162 |
| Definition and Examples | p. 162 |
| Properties of External Direct Products | p. 163 |
| The Group of Units Modulo n as an External Direct Product | p. 166 |
| Applications | p. 168 |
| Exercises | p. 174 |
| Biography of Leonard Adleman | p. 180 |
| Supplementary Exercises for Chapters 5-8 | p. 181 |
| Normal Subgroups and Factor Groups | p. 185 |
| Normal Subgroups | p. 185 |
| Factor Groups | p. 187 |
| Applications of Factor Groups | p. 193 |
| Internal Direct Products | p. 195 |
| Exercises | p. 200 |
| Biography of Évariste Galois | p. 207 |
| Group Homomorphisms | p. 208 |
| Definition and Examples | p. 208 |
| Properties of Homomorphisms | p. 210 |
| The First Isomorphism Theorem | p. 214 |
| Exercises | p. 219 |
| Biography of Camille Jordan | p. 225 |
| Fundamental Theorem of Finite Abelian Groups | p. 226 |
| The Fundamental Theorem | p. 226 |
| The Isomorphism Classes of Abelian Groups | p. 226 |
| Proof of the Fundamental Theorem | p. 231 |
| Exercises | p. 234 |
| Supplementary Exercises for Chapters 9-11 | p. 238 |
| Rings | p. 243 |
| Introduction to Rings | p. 245 |
| Motivation and Definition | p. 245 |
| Examples of Rings | p. 246 |
| Properties of Rings | p. 247 |
| Subrings | p. 248 |
| Exercises | p. 250 |
| Biography of I. N. Herstein | p. 254 |
| Integral Domains | p. 255 |
| Definition and Examples | p. 255 |
| Fields | p. 256 |
| Characteristic of a Ring | p. 258 |
| Exercises | p. 261 |
| Biography of Nathan Jacobson | p. 266 |
| Ideals and Factor Rings | p. 267 |
| Ideals | p. 267 |
| Factor Rings | p. 268 |
| Prime Ideals and Maximal Ideals | p. 272 |
| Exercises | p. 274 |
| Biography of Richard Dedekind | p. 279 |
| Biography of Emmy Noether | p. 280 |
| Supplementary Exercises for Chapters 12-14 | p. 281 |
| Ring Homomorphisms | p. 285 |
| Definition and Examples | p. 285 |
| Properties of Ring Homomorphisms | p. 288 |
| The Field of Quotients | p. 290 |
| Exercises | p. 292 |
| Polynomial Rings | p. 298 |
| Notation and Terminology | p. 298 |
| The Division Algorithm and Consequences | p. 301 |
| Exercises | p. 305 |
| Biography of Saunders Mac Lane | p. 310 |
| Factorization of Polynomials | p. 311 |
| Reducibility Tests | p. 311 |
| Irreducibility Tests | p. 314 |
| Unique Factorization in Z[x] | p. 319 |
| Weird Dice: An Application of Unique Factorization | p. 320 |
| Exercises | p. 322 |
| Biography of Serge Lang | p. 327 |
| Divisibility in Integral Domains | p. 328 |
| Irreducibles, Primes | p. 328 |
| Historical Discussion of Fermat's Last Theorem | p. 331 |
| Unique Factorization Domains | p. 334 |
| Euclidean Domains | p. 337 |
| Exercises | p. 341 |
| Biography of Sophie Germain | p. 345 |
| Biography of Andrew Wiles | p. 346 |
| Supplementary Exercises for Chapters 15-18 | p. 347 |
| Fields | p. 349 |
| Vector Spaces | p. 351 |
| Definition and Examples | p. 351 |
| Subspaces | p. 352 |
| Linear Independence | p. 353 |
| Exercises | p. 355 |
| Biography of Emil Artin | p. 358 |
| Biography of Olga Taussky-Todd | p. 359 |
| Extension Fields | p. 360 |
| The Fundamental Theorem of Field Theory | p. 360 |
| Splitting Fields | p. 362 |
| Zeros of an Irreducible Polynomial | p. 368 |
| Exercises | p. 372 |
| Biography of Leopold Kronecker | p. 375 |
| Algebraic Extensions | p. 376 |
| Characterization of Extensions | p. 376 |
| Finite Extensions | p. 378 |
| Properties of Algebraic Extensions | p. 382 |
| Exercises | p. 384 |
| Biography of Irving Kaplansky | p. 387 |
| Finite Fields | p. 388 |
| Classification of Finite Fields | p. 388 |
| Structure of Finite Fields | p. 389 |
| Subfields of a Finite Field | p. 393 |
| Exercises | p. 395 |
| Biography of L. E. Dickson | p. 398 |
| Geometric Constructions | p. 399 |
| Historical Discussion of Geometric Constructions | p. 399 |
| Constructible Numbers | p. 400 |
| Angle-Trisectors and Circle-Squarers | p. 402 |
| Exercises | p. 402 |
| Supplementary Exercises for Chapters 19-23 | p. 405 |
| Special Topics | p. 407 |
| Sylow Theorems | p. 409 |
| Conjugacy Classes | p. 409 |
| The Class Equation | p. 410 |
| The Probability That Two Elements Commute | p. 411 |
| The Sylow Theorems | p. 412 |
| Applications of Sylow Theorems | p. 417 |
| Exercises | p. 421 |
| Biography of Ludwig Sylow | p. 427 |
| Finite Simple Groups | p. 428 |
| Historical Background | p. 428 |
| Nonsimplicity Tests | p. 433 |
| The Simplicity of A5 | p. 437 |
| The Fields Medal | p. 438 |
| The Cole Prize | p. 438 |
| Exercises | p. 439 |
| Biography of Michael Aschbacher | p. 442 |
| Biography of Daniel Gorenstein | p. 443 |
| Biography of John Thompson | p. 444 |
| Generators and Relations | p. 445 |
| Motivation | p. 445 |
| Definitions and Notation | p. 446 |
| Free Group | p. 447 |
| Generators and Relations | p. 448 |
| Classification of Groups of Order Up to 15 | p. 452 |
| Characterization of Dihedral Groups | p. 454 |
| Realizing the Dihedral Groups with Mirrors | p. 455 |
| Exercises | p. 457 |
| Biography of Marshall Hall, Jr. | p. 460 |
| Symmetry Groups | p. 461 |
| Isometries | p. 461 |
| Classification of Finite Plane Symmetry Groups | p. 463 |
| Classification of Finite Groups of Rotations in R3 | p. 464 |
| Exercises | p. 466 |
| Frieze Groups and Grystallographic Groups | p. 469 |
| The Frieze Groups | p. 469 |
| The Crystallographic Groups | p. 475 |
| Identification of Plane Periodic Patterns | p. 481 |
| Exercises | p. 487 |
| Biography of M. C. Escher | p. 492 |
| Biography of George Pólya | p. 493 |
| Biography of John H. Conway | p. 494 |
| Symmetry and Counting | p. 495 |
| Motivation | p. 495 |
| Burnside's Theorem | p. 496 |
| Applications | p. 498 |
| Group Action | p. 501 |
| Exercises | p. 502 |
| Biography of William Burnside | p. 505 |
| Cayley Digraphs of Groups | p. 506 |
| Motivation | p. 506 |
| The Cayley Digraph of a Group | p. 506 |
| Hamiltonian Circuits and Paths | p. 510 |
| Some Applications | p. 516 |
| Exercises | p. 519 |
| Biography of William Rowan Hamilton | p. 524 |
| Biography of Paul Erdos | p. 525 |
| Introduction to Algebraic Coding Theory | p. 526 |
| Motivation | p. 526 |
| Linear Codes | p. 531 |
| Parity-Check Matrix Decoding | p. 536 |
| Coset Decoding | p. 539 |
| Historical Note: The Ubiquitous Reed-Solomon Codes | p. 543 |
| Exercises | p. 545 |
| Biography of Richard W. Hamming | p. 550 |
| Biography of Jessie MacWilliams | p. 551 |
| Biography of Vera Pless | p. 552 |
| An Introduction to Galois Theory | p. 553 |
| Fundamental Theorem of Galois Theory | p. 553 |
| Solvability of Polynomials by Radicals | p. 560 |
| Insolvability of a Quintic | p. 564 |
| Exercises | p. 565 |
| Biography of Philip Hall | p. 569 |
| Cyclotomic Extensions | p. 570 |
| Motivation | p. 570 |
| Cyclotomic Polynomials | p. 571 |
| The Constructible Regular n-gons | p. 575 |
| Exercises | p. 577 |
| Biography of Carl Friedrich Gauss | p. 579 |
| Biography of Manjul Bhargava | p. 580 |
| Supplementary Exercises for Chapters 24-33 | p. 581 |
| Selected Answers | p. A1 |
| Index of Mathematicians | p. A45 |
| Index of Terms | p. A47 |
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