Good teacher, his Number Theory book felt really good though I have no comparable in Number Theory. I must say Number Theory and Combinatorics are the most difficult topics I got acquainted with in undergrad.
Number Theory is really weird because the definitions and theorems are so often straightforward and easy to understand (you could explain Fermat's Last Theorem to a bright school kid), but the proofs can be devilishly complicated.
Tainnor|2 years ago