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- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!agate!dog.ee.lbl.gov!csa2.lbl.gov!sichase
- From: sichase@csa2.lbl.gov (SCOTT I CHASE)
- Newsgroups: sci.math
- Subject: Re: An interesting limit problem.
- Date: 29 Jul 92 18:03:06 GMT
- Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
- Lines: 53
- Distribution: na
- Message-ID: <25018@dog.ee.lbl.gov>
- References: <1992Jul25.212844.1@lure.latrobe.edu.au> <Bs1xzu.DFp@news.cso.uiuc.edu> <1992Jul28.191037.28756@gdr.bath.ac.uk> <1992Jul29.000223.27339@massey.ac.nz>
- Reply-To: sichase@csa2.lbl.gov
- NNTP-Posting-Host: 128.3.254.197
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-
- In article <1992Jul29.000223.27339@massey.ac.nz>, news@massey.ac.nz (USENET News System) writes...
- >
- >I believe that it is far more important to understand the meaning of
- >the operations of arithmetic than to be able to work through the
- >algorithms like trained monkeys without having a clue why they work.
- >(I know some bright spark will ask how many monkeys I've trained to
- >do long division - well, no actual monkeys, but a lot of great apes :-)).
-
- This is certainly the crucial point. As a physics instructor I am convinced
- that unlike in botany, one cannot learn the concepts of math or physics without
- *doing* the work. And the only acceptable proof that a student deeply
- understands a concept is to *apply* it to solving a problem. So I think that
- the distinction you make between understanding and being able to work through
- the algorithms is completely falacious.
-
- I remember having a specific dialog once (as a physics TA) with a premed
- student who came to my office on the day they learned Gauss's law in EM.
- She was accustomed to memorizing fact and considering the matter done.
-
- ME: Did you follow today's lecture?
- HER: Sure.
- ME: You understand Gauss's Law?
- HER: Sure.
- ME: OK. Please calculate the field of an infinite uniformly charged
- cylinder using Gauss's Law.
- HER: But I understand Gauss's Law.
- ME: OK, then just do the problem.
- HER: I said I understand it!
- ME: No problem. Then just solve the problem.
- HER: Hey! I studied the chapter yesterday and understood the lecture today.
- Gauss's law says that the volume integral of the enclosed charge density is
- proportional to the surface integral of the flux.
- ME: That's correct. Please (!) do the problem.
- HER: What for?! I understand Gauss's Law.
- ME: You keep saying that, but you really don't. I suggest that if you expect
- to pass the midterm that you make an attempt to solve the problem.
- HER: You're not helping me.
- ME: I can't help you until I can see what you don't understand. I can see
- that you have memorized the textbook. Please try to do the problem, and when
- you get stuck, I'll help.
- HER: I don't need help with Gauss's Law. I understand Gauss's Law. If you
- won't help me with what I need help with, then I'll go to another TA.
- ME: OK. It's your choice. But I promise you that until you have worked out
- a dozen problems that you don't really understand Gauss's Law.
- HER: BUT I UNDERSTAND GAUSS'S LAW...
-
- -Scott
- --------------------
- Scott I. Chase "The question seems to be of such a character
- SICHASE@CSA2.LBL.GOV that if I should come to life after my death
- and some mathematician were to tell me that it
- had been definitely settled, I think I would
- immediately drop dead again." - Vandiver
-