1. The problem statement, all variables and given/known data Not sure if you guys can get this link http://www.maths.uwa.edu.au/devsite/Units/math3341-s1-2008-crawley/assignments-solutions/Sheet 4 should be able to. Question is quesiton two. 2. Relevant equations Not many besides the general seperation of solutions sort of thing but im a bit unsure how to apply that with three variables. 3. The attempt at a solution In previous examples we had some symmetry that meant we could knock out say the theta dependance on something but im not sure here. I tried letting u = T(t)R(r)K(theta) and just fiddling a bit but came up trumps as i tried to fit the R function to a solution of the bessel function which we expect from whats given. I get the T(t) function as a sin + cos solution with argument lambda*c where -lambda squared is the constant i assign to the two sets of functions in seperation of variables. Thats sort of right i guess, not sure where the plus or minus comes from but then again i don't know how they get omega. I think im on the right track looking for the solution form of u i gave im just not sure how to follow through nor how to link the two constants that arise from applying seperation of variables twice. Hope that made sense :S Cheers -G EDIT: Nevermind, im retarded and can't read my own notes/do algebra properly. Mods can delete if you want.