138 reputation
9
bio website
location Michigan
age 51
visits member for 3 years, 4 months
seen Sep 15 '13 at 19:57

I'm a software architect specializing in solid modeling. I've been programming since the early 1980's (yikes!)

I studied mathematics at Arizona State University, but was seduced away by fame and fortune before finishing my graduate work.


Sep
21
comment 4 items add up to and multiply to 7.11 what are the value of the items?
Hmmm, the prime factors of 711 are 3*3*79. There aren't many choices for the prices here, and none of them add up to 711. For example, 1*1*9*79 = 711, but the sum isn't even close.
Sep
21
comment 4 items add up to and multiply to 7.11 what are the value of the items?
Hint: This is a Diophantine problem. Besides the sum and product, you also have that the answers (expressed in cents) are integers.
Sep
21
awarded  Commentator
Sep
21
comment Curvature of the image of a curve projected onto a surface
I haven't tried yet, but will sometime in the next week (or two). I don't see why it wouldn't though. I'll post the Mathematica results here when I do.
Sep
21
awarded  Scholar
Sep
21
awarded  Benefactor
Sep
21
accepted Curvature of the image of a curve projected onto a surface
Sep
20
comment Curvature of the image of a curve projected onto a surface
Thanks, I appreciate the effort you put into this. I really like the idea of creating an orthogonal basis in the tangent space. I can make this work.
Sep
20
comment Curvature of the image of a curve projected onto a surface
Thanks for this. I'm not clear why you say that I forgot to mention p, k, and d, (as k and d are of your own construction) and I don't know what you mean "it's a pullback". I'm not I can I turn this into a finished solution for d given that S is unknown in advance (we are only guaranteed that we can inquire it's derivatives).
Sep
20
comment Curvature of the image of a curve projected onto a surface
It's not clear to me that the construction as you describe it gives the correct curve. Can you justify the idea that there is a locally aligned parametrization that has the second derivative projection properties? Unfortunately I have to award the bounty soon, so please answer quickly. I'll give it some further thought myself.
Sep
18
comment Curvature of the image of a curve projected onto a surface
@alex: the surface will generally be a NURBS surface, so there is no hope of an implicit form. Thanks for the suggestion.
Sep
14
revised Curvature of the image of a curve projected onto a surface
edited tags
Sep
14
awarded  Promoter
Sep
14
revised Curvature of the image of a curve projected onto a surface
added 66 characters in body
Sep
13
answered Archimedes and center of gravity of an triangle
Aug
31
comment “Mathematical Induction”
ODEs do it for me every time!
Aug
31
awarded  Teacher
Aug
31
revised “Mathematical Induction”
added 141 characters in body
Aug
31
answered “Mathematical Induction”
Aug
25
comment Curvature of the image of a curve projected onto a surface
@anon: Thanks for this. I intend to see if I can get it to work in Mathematica, but I haven't gotten to it yet.