10 lessons I wish I had learned before I started teaching differential equations

    Some thirty or so years ago, Bessel functions were included
    in the syllabus, but in our day they are out of the question.

lolwut? Maybe it's just a physics thing, but most of the differential equations we solved in college needed Bessel functions of some sort (usually because of cylindrical/spherical symmetry).

Educational essay worth the read.