Anyone has a good recommendation of a free pdf book on group theory?

Question

Anyone has a good recommendation of a free pdf book on group theory?

I am specially interested in its application for computer science, however, I do not want it to be less mathematically rigorous just because of that.

I found one that was good, but it only dealt with commutative groups throught the text :(

Answer 1

We used this (Judson) in my Algebra class. It's pretty good and offers numerous computational exercises using Sage and has sections on cryptography and other computational topics. I enjoyed it.

Note that this text covers more than just group theory and goes into rings, fields, modules, etc. It is meant as a first (and second) course in Algebra text.

Answer 2

Have you ever seen this?

Schaum's outline of theory and problems of group theory

Answer 3

If you are fearless, Milne's notes on group theory are pretty good (they are meant to a first year graduate-level course in mathematics): http://www.jmilne.org/math/CourseNotes/gt.html

Answer 4

There are online copies of Artin's Algebra 2nd Ed