18,779 reputation
41963
bio website none
location Ann Arbor, MI
age 76
visits member for 1 year, 10 months
seen 3 hours ago

I am a retired software developer. I retired at the end of 2003 and since then my computer programming activities have been for recreational purposes. I find Mathematica excellent for that.

I started using Mathematica in 1997 (Ver. 3). I am currently using Ver. 9. Although I have used Mathematica for all kinds of stuff, I use it mostly to pursue my long standing interest in Euclidean geometry, both in the classical Greek synthetic form and in the more modern analytical form.


2d
revised Getting message DSolve::conarg:
Major clean-up
2d
comment Mapping points on the unit circle
Nice answer, but no need for Show and ListPlot. Suggest Graphics[{EdgeForm[Thick], FaceForm[None], Rectangle[{-1, -1}, {1, 1}], Red, PointSize[Medium], Point[Flatten[points, 1]]}] and Graphics[{Thick, Circle[], Red, PointSize[Medium], Point[Flatten[transformation@points, 1]]}]
2d
revised Volume enclosed by two surfaces of revolution
edited title
2d
reviewed Reviewed Install issue: Mathematica 9 on Ubuntu 13.10
2d
revised Install issue: Mathematica 9 on Ubuntu 13.10
added 33 characters in body
2d
comment Volume enclosed by two surfaces of revolution
The volume enclosed by the two surfaces formed by revolving your two curves about the x-axis is infinite unless you constrain the domain of the independent variable, say to the interval x = 0 and x = π/4, these being the values at which the two curves intersect.
Aug
29
revised Conceal GUI source code
deleted 19 characters in body
Aug
29
comment Menu item “Interrupt Evaluation…” missing in V10
The documentation claims it is still available even though it's no longer there. And the shortcut given Cmnd + , doesn't work either; that combination of keys brings up the Preferences dialog. A serious problem.
Aug
29
revised Menu item “Interrupt Evaluation…” missing in V10
Minor clean-up
Aug
29
revised Why does WordData fail to find “PartsOfSpeech” when given a list of two words?
Answered issue raised in comment
Aug
29
revised Why does WordData fail to find “PartsOfSpeech” when given a list of two words?
Answered issue raised in comment
Aug
29
revised Why does WordData fail to find “PartsOfSpeech” when given a list of two words?
added 9 characters in body; edited tags; edited title
Aug
29
revised Why does WordData fail to find “PartsOfSpeech” when given a list of two words?
added 314 characters in body
Aug
29
answered Why does WordData fail to find “PartsOfSpeech” when given a list of two words?
Aug
29
revised How to solve two non-linear equations in two variables
Major clean-up
Aug
29
revised Sum rule in integration not working
added 5 characters in body; edited title
Aug
27
comment Some global variables are defined even at the start of a fresh session
Can confirm this happens on OS X in V10 but not in V9. Immediately after stat-up the the Global context seems to be a bit dirty.
Aug
27
revised Some global variables are defined even at the start of a fresh session
Middling clean-up; edited tags
Aug
27
answered Problem with general assumptions
Aug
27
revised Problem with general assumptions
Middling clean-up