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

Jul
15
awarded Notable Question
Jul
14
answered Trouble understanding math proofs
Jun
30
comment If $P$ is true then not $Q$
It might help if you would acknowledge previous things from the literature of very much the same flavor, such as “This sentence is false.” Anyway, my take is that the nature of the resolution of what you have proposed is independent of the negation within it. That is, “If this statement is true then it will rain tomorrow.” has the same type of resolution as the statement you propose.
Jun
30
answered Square root and principal square root confusion
Jun
30
answered Why is a geometric progression called so?
Jun
25
comment Rhetorical evasion
A related question is how to derail an argument at its start, as in deflecting nosy questions. For this purpose, Esperanto is an excellent resource. Here is an example: esperanto-usa.org/en/content/esperanto-makes-horse-sense
Jun
22
comment Are angles ever multiplied?
excellent point (about m/m)
Jun
11
revised Help to understand material implication
referenced the classic fact that symmetry together with transitivity does not imply reflexitivity
Jun
11
comment 'Obvious' theorems that are actually false
This situation is dealt with in detail on page 30 of the book ESSENTIALS OF ABSTRACT ALGEBRA by Bundrick and Leeson (1972).
May
30
awarded Popular Question
May
29
awarded Nice Answer
May
19
asked History of alphabet soup
Apr
14
answered I want to learn math from zero
Apr
14
asked What is the side-view of a cylinder?
Mar
18
awarded Necromancer
Dec
13
comment Correct usage of the verb "tense"
FWIW: One example, out of many, of how punctuation affects meaning: “Americans like to live in the present tense.” versus “Americans like to live in the present, tense.”
Dec
13
comment How can I tell if a small specialized community is dying or if the long time-scale of activity is natural?
A classic example of a community with a long time-scale, and significant hiatuses, is the Esperanto Movement. Because of impatience, or lack of vision, pundits from time to time declare it to have failed. However, Esperanto keeps outliving its obituary-writers.
Dec
13
awarded Student
Dec
12
awarded Autobiographer
Dec
12
asked When are non-homogeneous sets first encountered by students?
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