I'm a computer science student and I'm starting to learn Abstract Algebra next week.
I'd like to get a suggestions for good PDF book about Abstract Algebra.
This is a good textbook: Abstract Algebra: Theory and Applications by Tom Judson. I learned abstract algebra from it and it has a lot of computer programming exercises as well as a SAGE companion. Its introductory but goes through a lot of important results in introductory abstract algebra. Moreover its free!
Here are some suggestions:
There are some variations in the listed books so take a look at the table of contents at least to get an idea of which one will suit your needs.