Are you ready? Start with Algebraic Structures. [Aug. 31, 2011, 6:18 p.m.]
http://learn.uci.edu/oo/getOCWPage.php?course=OC0111113&lesson=2&topic=1&page=1
This course will become read-only in the near future. Tell us at community.p2pu.org if that is a problem.
http://learn.uci.edu/oo/getOCWPage.php?course=OC0111113&lesson=2&topic=1&page=1