TheDoctor
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 Oct 12 awarded Nice Question Sep 17 answered Efficiently generating 2-D Gaussian random fields on the sphere Sep 11 awarded Yearling Sep 10 answered SeriesData sucks when it can. How do I keep SeriesData from sucking? Sep 7 awarded Commentator Sep 7 comment Find six vectors with rational entries under constraints? You can split the 6x6 problem into two sets of 3, which is easier to satisfy (or a 4+2). The most general is 5+1 (where the 5 rows are independent). Instead of solving over rationals, you can work with integers (just multiply the 6x6 matrix of rationals by the LCD to obtain a matrix of integers). Sep 5 comment Find six vectors with rational entries under constraints? Perhaps you should state the full problem — and also where and how it arises. Note that, the conditions you stated require that the vectors must be linearly dependent (as the sum of each columns adds to zero). It is trivial to obtain the full solution for the 2x2 problem, and the 3x3 problem can be solved in terms of pythagorean triples. Sep 3 revised Find six vectors with rational entries under constraints? Added two references. Sep 3 answered Find six vectors with rational entries under constraints? Sep 3 answered How to make all cells be displayed in TraditionalForm Aug 7 comment MMA breaks down when DSolve -ing a third-order linear ODE I cannot see how the Weber function is LaplaceTransform-invariant, and I don't know what you mean about "in the physical sense". In the "mathematical sense" I played around in some special cases, and I looked in Tables of Laplace Transforms by Oberhettinger and Badii, which includes transforms of Weber functions, but your assertion is still not clear to me. Aug 7 comment MMA breaks down when DSolve -ing a third-order linear ODE I don't see how solutions to these equations, which appear to be unbounded for large Abs[x], could be LaplaceTransform-invariant functions. Do you have a reference for this? Aug 4 answered MMA breaks down when DSolve -ing a third-order linear ODE Aug 1 awarded Curious Jul 31 asked Tree graph showing the orbits under the Collatz map? Jul 27 answered What is behind Mathematica's experimental FindFormula function? Jul 8 comment Plot is discontinuous (it shouldn't be) The leading term in the asymptotic expansion for x<0 is 2 Cos[2 Pi x]. For x>0, the expression is much more complicated but the leading term is A Cos[2 Sqrt[2] Pi x+d] where A~1.7 and d~0.5. The transition between these asymptotic behaviours is in over -3 < x < 3. Jun 30 revised Wavelet Transform Modulus Maxima (WTMM) method Added two references, as requested. May 6 comment How to make the docked cell and the navigation toolbar in the Slide Show? I note that this bug in Inherited does not appear to be fixed? Also, rather than using nested If's, how could you use Switch instead? All my attempts fail... Apr 11 revised Expansion of a hypergeometric function takes ages with Mathematica 9 and 10 (regression?) Added simpler method for correct and rapid series computation.