  These lecture notes concern information-theoretic notions of entropy. They
are intended for, and have been successfully taught to, undergraduate students
interested inresearch careers. Besides basic notions of analysis related to
convergence that are typically taught in the first or second year of
undergraduate studies, no other background is needed to read the notes. The
notes might be also of interest to any mathematically inclined reader who
wishes to learn basic facts about notions of entropy in an elementary setting.
