> Instead, spend a few hours curating online resources that may serve as notes for students; better yet, just photocopy the handwritten notes that every mathema

> Instead, spend a few hours curating online resources that may serve as notes for students; better yet, just photocopy the handwritten notes that every mathematics teacher I've ever had seems to have for each lecture they give :-) Otherwise, Paul's Online Math Notes tackles Calculus and ODEs, and IIRC gives an intro to PDEs as well. I recently taught a course on ODEs, and it took far more than "a few hours" to curate enough online resources to cover the curriculum. The sad truth is once you get out of calculus, the number of quality online resources for advanced mathematics decays rapidly, and the coverage gets spotty as well. This is not to mention that those resources rarely agree on notation, which makes them more confusing to students (and therefore less helpful). There's something to be said for requiring a single edition of a single textbook, just for consistency's sake, even though that's caused all this publisher drama in the first place.