# [Edu-sig] Concrete Mathematics

Kirby Urner pdx4d@teleport.com
Tue, 23 May 2000 09:39:01 -0700

```>OK, sounds like "Concrete Mathematics" (CM) is my next
>investment

Bought this book yesterday.[1]  Looks good -- like Tim
says, not as "intense and telegraphic" as 'The Art of
Computer Programming', but with Knuth an author, bringing
the same expertise.  This is a text book for an actual
course at Stanford.

My initial reaction on reading these books is pleasurable,
given how much it positively reinforces what I'd come
up with in the 'Numeracy + Computer Literacy' series.[2]

I'd sort of intuitively gravitated to Pascal's Triangle
as a conceptual nexus, a "grand central station", and
that's what these books do too, in the same context of
talking about series.  Knuth's Volume 1 even shows the
tetrahedral packing of spheres (exploded view), a
geometric interpretation of one of the Pascal columns.

What's different about my Oregon Curriculum Network
approach is that I develop this geometric connection
more intensively, making use of Buckminster Fuller's
concentric hierarchy as defined by 26 data points,
plus a jitterbugging thereof -- which points I have
the option to express in whole number coordinates,

In going with polyheda as paradigm objects (in the OOP
sense), I'm bringing in Computer Game Programming 101
(e.g. rotation matrices, even quaternions -- the
'Tomb Raider' engine is quaternion-based) which is
more obviously relevant to a lot of kids -- as is
spatial geometry in general (after all, we live in it).

Also, whereas CM is earmarked as grad schooler or upper
level, I'm pretty clear we have the option to alter the
into the math classroom).  We already touch on a lot
of these same topics at these earlier levels, but don't
elaborate much (e.g. mention primes, but not Fermat's
"little theorem" or the link to RSA encryption) because
everything is geared towards an intensive calculus
experience, for which you need precalc.

Again, I have nothing against teaching calculus (was
a calculus teacher myself for two years), and CM is
full of Riemann sums, right along with the SIGMAs.  And
I didn't mean to say we should bleep over the chain rule
or integration by parts, merely that it should be an
option to NOT spend a _whole year_ doing calculus at
the pre-college level AND to nevertheless be considered
a top performing math student.  In other words, if
you want to be a "star" in math, you might do something
more along the lines of CM (and my essay, ahem), and
less along the lines of today's conventional AP calc
course.

These kinds of "remixings" happen all the time.  Math
ed is like music -- you go through phases, things come
into vogue.  I'm not saying we should get suckered by
are fighting as "fuzzy math" seems pretty faddish to
me), but on the other hand, we need to be aware that
long term trends alter the landscape in math, as in
every other discipline.  Change happens.

My view is that pre-college math is out of synch with
what kids could most use and benefit from.  Calculus
is over-stressed.  Fluency with calculus ideas should
be developed with an eye towards looking at other topics
(a proof of relevance), with more intensive drilling in
this subject saved for those most likely to need it
professionally.

Too much other good stuff is falling by the wayside in
the rush to cram calculus into the final year of pre-
college.  We need a more accelerated path (i.e. a
"first pass" tour of duty) through that material that
doesn't get so bogged down in the nitty gritty and
leave too many students turned off math for life.

In making more room for other topics, we'll have the
opportunity to phase in computer languages, Python
included (it has a lot going for it, as do some of
the others).

Text books are too slow to match these needs.  My
approach is going to be based in cyberspace as the
primary source medium, not text books.  Some of our
materials will be more like "finished goods", for
teachers who want those (e.g. PDF handouts).  But I'm
primarily interested in ideas, with teachers customizing
content to fit their local needs and students.  A lot
of this will be private sector and commercial, with
curriculum supplies being sold via the same websites.
Also working the DVD jukebox angle.

Kirby
4D Solutions

PS: I see Knuth has his own ideas about calculus reform,
which I'm curious to read.  Just have to find a way to
get TeX files deciphered in Windows (or BeOS).

[1] Ronald L. Graham, Donald E. Knuth, Oren Patashnik,