Carol Whitehead & David A Towers 
Guide to Abstract Algebra [PDF ebook] 

Guide to Abstract Algebra is a comprehensive and accessible text covering the basic topics of an introductory abstract algebra course. New concepts are introduced gradually and illustrated by a variety of worked examples.New features in this second edition are:- Two new chapters on Number Systems and Polynomials- Proofs by induction are introduced through a new section on sequences and recurrence relations- Fully updated to reflect the needs of today’s first year undergraduate students This book is ideal for first year undergraduate courses in Mathematics or Computer Science.