This text offers students clarity and instructors flexibility. Its thorough coverage of applications, algorithms, and examples, and its inclusion of many proofs explain and reinforce the material. Its traditional organization makes it a suitable text for several courses. Attention to contemporary topics such as key cryptosystems and coding theory makes the text current. It is flexible enough to be used for courses in applied algebra or modern (abstract) algebra.Robert F. Lax is the author of 'Modern Algebra and Discrete Structures', published 1997 under ISBN 9780060438784 and ISBN 0060438789.