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 Nov 20 answered Finding all vectors of $\vec{y}$ such that $\operatorname{span} \left \{ \vec{v_1}, \vec{v_2}, \vec{y} \right \} = \mathbb{R^3}$ Nov 18 answered Solve a function with sum in Mathematica? Nov 18 comment How to make Runge-Kutta for solving nonlinear ODE system in Mathematica @George: Finally, I keep telling you to try to reduce your problems down to the bare minimum. This is both good for you and for the forum. The act of isolating your sticking point will normally help you solve it. And if you're still stuck, you can post a nice clear question that other people can work on without having to dig through the muck for you. Nov 18 comment How to make Runge-Kutta for solving nonlinear ODE system in Mathematica @George: You really should learn how to use Mathematica for the simple examples before you try to apply it to your real work. I've been helping you since August and neither your ability to program nor your ability to ask clear questions on a forum has increased. People want to help, but are not going to do ALL of your work for you. Make your questions either interesting or short. Long, messy, stupid and frustrating questions will get downvoted or ignored. Nov 17 comment Inverse of the polylogarithm Thanks Michael, can you give some specifics? Oct 18 comment Inverse of the polylogarithm @jspecter: $\text{Li}_n^{-1}(z) \approx z-2^{-n} z^2+(2^{1-2 n}-3^{-n}) z^3 + \dots$... but is the general coefficient known in closed form? Can it be summed as, e.g., a hypergeometric? Oct 18 asked Inverse of the polylogarithm Oct 17 answered Copy LaTex equations from Mathematica to Word directly? Sep 11 comment Solve recurrence relation $a(n)=2\cdot a(n-1)+5\cdot a(n-2)+6\cdot a(n-3)$ and the associated cubic The lazy way: W|A Sep 8 awarded Critic Aug 30 comment How to make simple iteration in Mathematica @J.M.: That should read f[0] = 1; f[n_Integer?Positive] := f[n] = n f[n-1] Aug 9 awarded Yearling Aug 2 revised Trace Determinant Plane Differential Eqns added the vector Y back into RHS of the DE Aug 2 suggested approved edit on Trace Determinant Plane Differential Eqns Aug 1 comment If $f(n) + (n+1)^2 = f(n+1)$ then what is $f\phantom{|}$? +1: Of course the general solution for arbitrary $f(0)=c$ is not too difficult. Jul 14 comment How to add compound fractions? And yet generations of students keep insisting on ambiguously stacking fractions... Jun 18 comment What is a good language to develop in for simple, yet customizable math programs? Also, sage has a web-based notebook interface and dynamic content: ineract. This makes it good for classroom work. Jun 10 comment Finding power series representation of $\int_0^{\frac{\pi }{2}} \frac{1}{\sqrt {1 - k^2\sin^2{x}}}\;{dx}$ Oh... you're missing a squared in your first sum Jun 10 comment Finding power series representation of $\int_0^{\frac{\pi }{2}} \frac{1}{\sqrt {1 - k^2\sin^2{x}}}\;{dx}$ Are you sure that the result you're trying to get is correct? The is an elliptic integral of the 1st kind, but the sum just yields a simple square root. (Type the following into Wolfram|Alpha: Integrate[1/Sqrt[1 - k^2*Sin[x]^2], {x, 0, Pi/2}] and Sum[k^(2 n) (2 n - 1)!!/ (2 n)!!, {n, 0, Infinity}]) Jun 5 awarded Announcer