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- Newsgroups: sci.math
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!purdue!mentor.cc.purdue.edu!pop.stat.purdue.edu!hrubin
- From: hrubin@pop.stat.purdue.edu (Herman Rubin)
- Subject: The harm of special cases Was: Re: Undivided distaste for algebra, more fuel for the fire...
- Message-ID: <C17JMw.CGp@mentor.cc.purdue.edu>
- Sender: news@mentor.cc.purdue.edu (USENET News)
- Organization: Purdue University Statistics Department
- References: <1993Jan19.083812@usno06.nor.chevron.com> <1993Jan19.214027.21851@schaefer.math.wisc.edu> <20JAN199311462556@mary.fordham.edu>
- Distribution: usa
- Date: Thu, 21 Jan 1993 14:16:07 GMT
- Lines: 44
-
- In article <20JAN199311462556@mary.fordham.edu> nissim@mary.fordham.edu (Leonard J. Nissim) writes:
- >In article <1993Jan19.214027.21851@schaefer.math.wisc.edu>,
- >mueller@schaefer.math.wisc.edu (Carl Douglas Mueller) writes...
-
- >>>2: My opinion: (you may wish to strech your legs here and skip this part)
- >>> Our schools
- >>> teach FOIL (first, outer, inner, last) instead of the distributive
- >>> principle for doing binomial expansion.
-
- >> I learned FOIL from my students the first time I was a TA. Nearly all of
- >>the students I've taught since then have told me that this is how they had
- >>learned to multiply binomials. I think that this is a rather TERRIBLE way
- >>to teach this! It hides what is going on and doesn't allow for the
- >>(rather easy -- if you learn it right) generalization to multiplication of
- >>more general polynomials.
-
- >I agree. I also learned FOIL for the first time at age 37 when teaching
- >Precalculus here. A student complained that FOIL was easier than the
- >distributive law; when I asked what FOIL was, he was shocked that I had
- >never heard of it. He was unimpressed by my statement that FOIL was a
- >special case of a more general law, and that it would be better to under-
- >stand the general law rather than to memorize the special case.
-
- This is what happens when tricks for special cases are taught instead of
- giving an understanding of far more general cases. Learning the FOIL
- trick above even obscures the understanding in this special case.
-
- But that is far too often done. The general notions of measure and
- integral, NOT the precise limitations and theory, can be rigorously
- taught at the level of high school algebra, and in fact the oldest use
- know of measure must go way back, and of integration about 5000 years.
- But if a student has learned that antiderivative is integration,
- it is harder for that student to learn the concept.
-
- The concept should also be taught in such a way that it is easy to
- generalize to path integrals, product integrals, integrals where both
- the generalized signed measure and the function are in arbitrary linear
- spaces, etc. This is relatively easy if the concept, and not the
- calculation, is kept in the forefront.
- --
- Herman Rubin, Dept. of Statistics, Purdue Univ., West Lafayette IN47907-1399
- Phone: (317)494-6054
- hrubin@snap.stat.purdue.edu (Internet, bitnet)
- {purdue,pur-ee}!snap.stat!hrubin(UUCP)
-