I've been grading calculus exams this week, and even though my students did quite well overall there were a couple of errors that I see every semester. Errors that make mathematicians' heads explode.

This is the second post (here’s the first one) about an approach to introducing the derivative to calculus students that is counter to what I’ve seen in textbooks and other traditional treatments of ...

Let A be a function algebra on a locally compact Hausdorff space. A linear isometry T: A → A is said to be of codimension 1 if the range of T has codimension 1 in A. In this paper, we provide and ...