[SOLVED] Laplace equation, cylindrical 2D 1. The problem statement, all variables and given/known data I am given the Laplace eq. in cylindrical coord. (2D), and I am told that we can assume the solution u(rho, Phi) = rho^n * Phi(phi). Find the general solution. 3. The attempt at a solution My teacher says that the general solution is u(rh,Phi) = SUM [A*cos(...) + B*sin(...)]*rho^n. It is tis version of the Laplace equation on the first equation on page 12 in here: http://people.ifm.liu.se/boser/elma/Lect4.pdf Why do we not differentiate rho?