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"Ten lessons I wish I had learned before I started teaching differential equations" is relevant here. I feel that DiffEq was the most useless undergraduate cour
by freetime2 8y ago
"Ten lessons I wish I had learned before I started teaching differential equations" is relevant here. I feel that DiffEq was the most useless undergraduate course that I took for my comp sci degree. They really didn't spend enough time going into the fundamental concepts so that I am not even sure I could recognize a differential equation if it were staring me in the face at this point... much less any of the tricks that they taught us to solve them.
10. TEACH CONCEPTS, NOT TRICKS
What can we expect students to get out of an elementary course in differential equations? I reject the “bag of tricks” answer to this question. A course taught as a bag of tricks is devoid of educational value. One year later, the students will forget the tricks, most of which are useless anyway. The bag of tricks mentality is, in my opinion, a defeatist mentality, and the justifications I have heard of it, citing poor preparation of the students, their unwillingness to learn, and the possibility of assigning clever problem sets, are lazy ways out.
In an elementary course in differential equations, students should learn a few basic concepts that they will remember for the rest of their lives, such as the universal occurrence of the exponential function, stability, the relationship between trajectories and integrals of systems, phase plane analysis, the manipulation of the Laplace transform, perhaps even the fascinating relationship between partial fraction decompositions and convolutions via Laplace transforms. Who cares whether the students become skilled at working out tricky problems? What matters is their getting a feeling for the importance of the subject, their coming out of the course with the conviction of the inevitability of differential equations, and with enhanced faith in the power of mathematics. These objectives are better achieved by stretching the students’ minds to the utmost limits of cultural breadth of which they are capable, and by pitching the material at a level that is just a little higher than they can reach.
We are kidding ourselves if we believe that the purpose of undergraduate teaching is the transmission of information. Information is an accidental feature of an elementary course in differential equations; such information can nowadays be gotten in much better ways than sitting in a classroom.
A teacher of undergraduate courses belongs in a class with P.R. men, with entertainers, with propagandists, with preachers, with magicians, with gurus. Such a teacher will be successful if at the end of the course every one of his or her students feels they have taken “a good course,” even though they may not quite be able to pin down anything specific they have learned in the course.
https://web.williams.edu/Mathematics/lg5/Rota.pdf https://web.williams.edu/Mathematics/lg5/Rota.pdf
- posterboy 8y agoUsing my own words, I'd say it was necessary though. One thing is the technique abstracted from the application, the other thing is a concept applying the technique. A fully abstract technique is awfully dry, so it's best taught connecting to other techniques. At that point, ODEs are a concept reduced to mathematics. I found ODEs interesting only later when used in Linear Algebra, which could lead to differential algebra. But there are different approaches and not one is the true one, so what should an instructor do? You need calculus for ODEs, so much is true I guess. Growth in hunter/food populations is interesting, too, plotting fox pop. over hare pop. Finally graphs can go in circles, not just in one direction along one axis.
- dan00 8y agoThe "bag of tricks" seems to allow to efficiently test a lot of people by writing tests and scoring them. Unfortunately it seems to be more about the score than about the learning.
- soVeryTired 8y agoI feel like Vladimir Arnold echoed a similar sentiment, but I can't find the quote. He was complaining that a first course in ODE and PDE tends to teach methods for finding exact solutions, even though equations with exact solutions are vanishingly rare in practice. Or maybe it was Rota again, who knows? Edit: nope, Rota again. Lesson one in your link :)
- enriquto 8y agodefinitely in the spirit of Arnold his book on ODE is otherworldly the quote maybe comes from his pde book
- madengr 8y agoSounds like this course, which is very well done. https://www.thegreatcourses.com/courses/mastering-differential-equations-the-visual-method.html https://www.thegreatcourses.com/courses/mastering-differenti...
- akmiller 8y agoI love #10, especially the last part. I would argue that even primary/secondary education is better served in this fashion. Relevant to a recent Joe Rogan podcast with Neil Degrasse Tyson on how many teachers in your life inspired you. Not as much about the transfer of information, especially today, it's about the excitement and inspiration around the topics you are presenting.