Fraleigh's abstract algebra text [1]. Sipser's Introduction to the Theory of Computation [2] is also excellent, and possibly of special interest to HN. [1] ht

Fraleigh's abstract algebra text [1]. Sipser's Introduction to the Theory of Computation [2] is also excellent, and possibly of special interest to HN. [1] http://www.amazon.com/First-Course-Abstract-Algebra-Edition/dp/0201763907/ref=sr_1_1 http://www.amazon.com/First-Course-Abstract-Algebra-Edition/... [2] http://www.amazon.com/Introduction-Theory-Computation-Michael-Sipser/dp/053494728X/ref=sr_1_2 http://www.amazon.com/Introduction-Theory-Computation-Michae...