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.
N. E. Gretsky and J. J. Uhl, Jr. Representations of bounded linear operators on Banach function spaces of vector-valued functions to Banach spaces are given in terms of operator-valued measures. Then ...
Linear Circuit Transfer Functions: An Introduction to Fast Analytical Techniques, Christophe P. Basso, Wiley, IEEE Press (www.wiley.com), ISBN: 978 111 923 637 5, glossy hardback, 445 numbered pages, ...