## A Reply to the Math Lingo Article

Roger A. Horn

1515 Mineral Square, Room 142

University of Utah

Salt Lake City, UT 84112

February 22, 1997

Dear Professor Horn:

An article by Professor R. Hersh (Math Lingo..., pp 48-51) in the recent issue (No 1, v 104)
of the Monthly has left me bewildered. As I see it, the author set out to caution his
colleagues about frequent confusion of words' math meanings and customary plain English
usages. The attempt is to be applauded. *I could not disagree with the author less. *
It is quite important from the outset to tell students that Mathematics employs its own
language wherein many well known words acquire a meaning different from what one might
expect. The advice is good and applies to all other sciences and fields of human endeavor.

However, a few points in the article have left me confused.

- The
*number*story. After many years of teaching Mathematics the author finally realized that an obnoxious student of his who claimed that 0 is not a number was actually right. For, when one says "I own a number of Calculus books", one does not mean 0 books, nor even 1 book. I cite:*In mathematical talk, "number" has several meanings. None is the plain English meaning.*At the risk of being dubbed humorless, I have looked up the word "number" in the American Heritage Dictionary. In the computerized version, there are 10 (most with several subarticles) distinct meanings for the noun and 4 additional meanings for the verb. Mathematics has been mentioned only once. It would be a relief to learn that the intention of the article was to sum up a part of the math folklore that has to do with math as a language. I read and reread the article several times. Some juxtapositions are indeed funny, but on the whole the article's tone is quite apologetic.

- The author writes:
*I say "math lingo", not language. It's jargon, a semidialect of English (or some other natural language), not a complete language. You can't say "I have a headache" or "You bore me" in math lingo.*For one, if in "You can't say", the author meant me, he was patently wrong as I belief many other mathematicians who also took the remark personally would justly claim. I can say this in math "lingo" (just let me define "I" and "a headache" appropriately which I will postpone until a more fitting occasion.)

Secondly, I wonder what the author may think of programming languages. Should these misfits who did not make it into math departments and make their living by writing software boast of mastering the FORTRAN lingo, or the C++ semidialect, or, more recently, the Java jargon?

Thirdly, on reading "... a complete language" one is reminded of the Godel's famous Incompleteness Theorem (it's a math article in a math magazine, after all.) This said, the whole argument of comparing contradictory meanings of math terms becomes vacuous. On the other hand, I am pretty sure the author did not mean to imply that, in order to be complete, a language should incorporate the two phrases "I have a headache" and "You bore me".

- Some of the examples quite plainly have nothing to do with mathematics. E.g., "amoebas
multiply by dividing" reflects more on the difficulties experienced by biology professors in an
undergraduate biology class than on a possibility of confusing math students. As an alternative,
I would suggest the following:
The

*matrix*'s other meaning is a*womb*, so a biology student taking a Linear Algebra class may well consider it indecency to discuss multiplication of a*matrix*by a*vector*whose other meaning is*another agent that transfers genetic material from one location to another*(The American Heritage Dictionary.)Or, turning again to the

*number*story, consider the plain English*The crowd was small in number.*Following the author, neither 0, nor 1, nor 2, nor ... what should I call the rest? - is a number, as one cannot say "The crowd was small in

*zero*", or "The crowd was small in*one*", etc. - Some terminological problems transcend barriers between sciences. Take, for example, the term "simple". The author asserts (and quite rightly) that mathematically simple curves may not appear at all simple even to an experienced math eye. A "simple leaf" is a valid biological term which is usually juxtaposed with a "compound leaf". However, one does not need a microscope to convince oneself on inspection that neither of the two has a really simple structure. The American Heritage Dictionary defines simple as "Having or composed of only one thing, element, or part." This definition suits better my perception of "indivisible". Now recollect that the word "atom" originates from the Greek "atomos" which means just that - indivisible. But who nowadays would dare calling an atom simple?

In conclusion, "plain English" as, for that matter, any "plain" language, is inherently ambiguous. By the end of the last century the fact has been recognized in Mathematics. Currently, even a Biology text that would never include a deduction, develops a peculiar vocabulary often by redefining "plain language" words. Thus, one may assume that the need for conscientiously accurate word usage has been recognized long ago by both scientist and pedagogs in Mathematics as much as in other sciences. Being the first to recognize the necessity of specifying the language, mathematicians may be expected to lead the effort of instilling this idea in the rest of the populace.

Josiah Willard Gibbs is known to have insisted that "Mathematics is a language". And, as Richard Feynman wrote, "To those who do not know Mathematics it is difficult to get across a real feeling as to the beauty, the deepest beauty of nature. ... If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in."

The obnoxious student of Professor Hersh was unequivocally wrong. Zero is a number. There is nothing to be apologetic about.

Sincerely,

Alexander Bogomolny, Ph.D.

President, Cut The Knot Software, Inc.

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