THAT'S What I Like To Hear

Up on campus today, I ran into a former student. He told me how he was doing and said that while my class was very difficult for him, he's found his subsequent math classes easier. That's what I like to hear from former students. It means one of two things: either I'm a more difficult teacher than others in the department, or I taught him so well that he actually retained the knowledge. Or maybe it's both. Anyway, it really made my day.