EDIT: I solved it. Sorry for waste of time! :( Here is the function ψ[x]: 0.0000551056 a0.25 (30240. a0.5 x - 80640. a1.5 x3 + 48384. a2.5 x5 - 9216. a3.5 x7 + 512. a4.5 x9)(-((a x2)/2)) I am trying to integrate ψ[x]*ψ[x] over all space (-infinity to +infinity). I don't get any error messages... it just says "running" for a good 5 minutes. Then it grinds to a halt and spits out the integral in its unsolved form. I have attached the notebook file if anyone is curious. I'm just really stumped on this one.