This text offers an introduction to error-correcting linear codes. The
book differs from other standard texts in its emphasis on the
classification of codes by means of isometry classes. It is based on the
successful German edition. The relevant algebraic concepts like finite
fields and group actions are developed rigorously. Cyclic codes are
discussed in great detail. In the last four chapters these isometry
classes are enumerated, and representatives are constructed
algorithmically with or without a prescribed automorphism group.