My undergraduate degree was in Mathematics (University of Dallas, 1971). My core interest is General Systems Theory. My career was mostly in computer programming, however, I also taught English, and high-school mathematics, in China for 9 years. I am currently semi-retired, drawing social security, and working on my various websites. As far as I am concerned, anything I do here is in the Public Domain.

Student Exercise Tasks (for Mathematics, Language Arts, etc.) - autocorrected

Index to Stewart's Calculus (4th ed.)

Apr
30
comment Idiom request for describing a situation in which someone give advantages to their enemy or opponent
also: to snatch defeat from the jaws of victory
Apr
30
comment Idiom request for describing a situation in which someone give advantages to their enemy or opponent
worth mentioning: en.wikipedia.org/wiki/Zugzwang
Apr
29
asked certain (humorous) quote about revision of an organization’s bylaws
Apr
3
comment Concrete examples of abstract algebra delivering simple solutions to hard problems
It seems to me that there ought to be a lot more answers to this question.
Apr
2
awarded Necromancer
Mar
20
comment Is there an online dictionary listing words spelled in reverse?
@Amen: Could you please elaborate?
Mar
9
comment Why is $1 - \frac{1}{1 - \frac{1}{1 - \ldots}}$ not real?
“how the the imaginary unit, i.e. the square root of −1−1 is involved” - FWIW, remember that, via the closed form formula for the solution of the general cubic equation, non-real numbers may be encountered, even though the roots are real.
Mar
8
comment If squaring a number means multiplying that number with itself then shouldn't taking square root of a number mean to divide a number by itself?
comment I'm adding for tracking / lookup purposes: examples of a disconnect between ordinary language and technical language.
Mar
8
revised If squaring a number means multiplying that number with itself then shouldn't taking square root of a number mean to divide a number by itself?
added disconnect comment re gcd
Mar
7
comment In calculus, which questions can the naive ask that the learned cannot answer?
@user4894: Action-at-a-distance doesn’t seem cranky?
Mar
6
comment When are non-homogeneous sets first encountered by students?
@Richard: The sets are more than homogeneous - they are cookie cutter. The set of real numbers, for example, on the other hand, contains many different types of numbers.
Mar
4
comment In calculus, which questions can the naive ask that the learned cannot answer?
Actually, we do know: neither space nor time is a continuum. See the work of Dewey B. Larson for elucidation on this: enciklopedia-vortaro-de-la-merk-angla.weebly.com/…
Mar
4
comment When are non-homogeneous sets first encountered by students?
“I can't imagine what you would ever do with it” - "A failure of imagination is not an insight into necessity." -- Patrick Barrow
Mar
3
answered Can squares be replaced by cycloids in the Pythagorean Theorem?
Feb
28
comment Do there exist any visual representations of prime factorizations?
@Charles: Thanks for the laugh!
Feb
17
answered Easy way to compute logarithms without a calculator?
Feb
9
comment Determine the number of integer solutions for $x_1+x_2+x_3+x_4+x_5 < 40$
Cool! I simply didn't know about that feature / technique.
Feb
7
comment Determine the number of integer solutions for $x_1+x_2+x_3+x_4+x_5 < 40$
What happened to the displays?
Feb
5
comment Country ranking by combination of factors
"The Age of Nations is past. The task before us now, if we would not perish, is to build the Earth." -- Teilhard de Chardin
Feb
3
comment What do you suggest I do to prepare? Thanks In advance!
Here is yet another link that might be helpful: math.stackexchange.com/questions/1077757/…
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