This text, based on course notes for the Berkeley course Math 245, "General Theory of Algebraic Structures" taught over the years, has now appeared in Springer's Universitext series, with ISBN 978-3-319-11477-4.
Here is the PDF file for the pre-Springer version.
If you have any corrections or comments, you can e-mail me: .
I maintain lists of answers to some questions submitted by students over the course of the semester. Here is the list from Spring 2014, and here is a similar list from Spring 2008 and Fall 2011. The pagination has changed from year to year as I revise the material. When I have some time, I hope to fuse these files, and give page-references matching the published version.