Bill Lampe, Ralph Freese, and JB Nation taught me how to solve problems in groups and rings (among other things). Nonetheless, I take responsibility for most of the mistakes and typos in the problems and solutions posted here. For the others, I blame readers who fail to report them to me.
Joking aside, in exchange for offering you these study materials for free, please do me the favor of emailing any mistakes or typos to williamdemeo at gmail.
Please send comments, suggestions, and corrections to email@example.com.