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 Apr8 awarded Yearling Apr8 awarded Yearling Jun12 awarded Guru Apr8 awarded Yearling Aug23 comment Mathematica 8 can not solve Eigenvalue problem You will probably want to use NSolve instead of Solve. NSolve gives out numeric answers. Aug23 answered Mathematica 8 can not solve Eigenvalue problem Jul27 accepted For what functions does $\int_{-\infty}^{\infty}x \sin(f(x))\,dx$ converge? Jul27 awarded Supporter Jul27 awarded Scholar Jul27 awarded Critic Jul27 comment For what functions does $\int_{-\infty}^{\infty}x \sin(f(x))\,dx$ converge? Now that you say it Sin(x^3+x) does become Cos(x^3) Sin(x) + Cos(x) Sin(x^3) which helps a ton. Thanks. I guess I was mostly hoping for some nice sufficient condition for a broad class of functions. Jul26 comment For what functions does $\int_{-\infty}^{\infty}x \sin(f(x))\,dx$ converge? Yes. I was thinking of well behaved differentiable functions. By "grows fast enough" I assumed that a large enough Big O is what was necessary to guarantee that the integral converges. To make the issue more concrete, what polynomials f cause the integral to converge? Jul26 awarded Student Jul26 asked For what functions does $\int_{-\infty}^{\infty}x \sin(f(x))\,dx$ converge? Jul1 answered Generating a non uniform discrete random variable May18 answered Complex Exponents Apr18 answered Motivation for the Math Required for Computer Science Apr13 awarded Enlightened Apr8 awarded Good Answer Apr8 awarded Mortarboard