481 reputation
17
bio website hexgridutilities.codeplex.com
location Canada
age 58
visits member for 1 year, 6 months
seen Aug 23 at 21:23

A physicist, accountant (CGA,CPA), and software developer by training, and a professional developer by employment, I wrote my first computer program in FORTRAN w/ WATFOR in high school. Since then I have written device drivers for a PDP-15, CAD/CAM applications in C, and Database applications in everything from FORTRAN (?!) and C to SQL and MS-Office.

I currently build financial and business applications professionally, mostly with VBA / C# / SQL, while developing my own Napoleonics game engine in C# on weekends and evenings.


Mar
22
comment Why do we require radians in calculus?
@Ruslan: No, how can you say that on a Mathematics site! There is a world of difference between N⋅m and J; namely that one measures the magnitude of a pseudo-vector, and the other the magnitude of a vector.
Mar
2
awarded  Yearling
Jan
23
answered What is the difference between a point and a vector
Jan
13
awarded  Autobiographer
Dec
22
comment 'mod' or 'remainder' symbol valid in maths?
Thank you for the motivation to read Eric's post closely once again; you are correct.
Dec
22
comment 'mod' or 'remainder' symbol valid in maths?
@BillDubuque: The % operator in C-like languages does not respect the equivalence classes of a finite ring over the integers under normal multiplication and addition when one or more operands is negative. Forgive me if my terminology is not spot on - it has been almost 4 decades since I last did the algebra rigorously.
Dec
22
comment 'mod' or 'remainder' symbol valid in maths?
+1 for noting that % is a remainder operator in C-like languages, and not a modulo operator.
Dec
22
comment 'mod' or 'remainder' symbol valid in maths?
The percent operator in 'C'-like languages is a remainder operator not a modulo operator. Why Kernighan and Ritchie made this decision is lost in the mists of time, but it is unfortunate. Here is an article on the difference by one of the world's C# experts: blogs.msdn.com/b/ericlippert/archive/2011/12/05/…
Dec
13
comment Of any 52 integers, two can be found whose difference of squares is divisible by 100
Nice generalization of the technique used above by @Matthew Conroy.
Nov
22
comment game combinations of tic-tac-toe
Accounting for symmetry, this can quickly be reduced by a factor of 6, as there are only 12 possible two move openings, not 8*9=72.
Nov
10
comment How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen?
I have known this question/riddle for nearly half a century, and never expected to see still another good valid answer.
Nov
9
comment Is my proof correct for: $\sqrt[7]{7!} < \sqrt[8]{8!}$
Beat me to it. Well done.
Oct
18
answered Finding the equation for a tangent line at a certain point
Oct
9
comment can a great circle route be predicted from initial condition?
Are you looking for an exact great circle, or an approximation to some accuracy from a series of varying rhumb lines?
Oct
9
answered Long-Run proportion that harmonic light bulb is on
Oct
9
comment Long-Run proportion that harmonic light bulb is on
That's spectacularly unconvincing.
Sep
17
comment Multiplication modulo proving a set is a group
Since when is 2 * 2 modulo 4 = 1 true?
Sep
9
comment What are some examples of mathematics that had unintended useful applications much later?
More pertinent; What branch of mathematics, if any, didn't have unintended useful applications much later.
Sep
7
answered Change of basis (Gram-Schmidt)
Sep
7
comment product of six consecutive integers being a perfect square
A wall of text is never elementary.