1. The problem statement, all variables and given/known data Obtain the solution of the diffusion equation, u(t,x) a) satisfying the boundary conditions: u(t,0)=u1, u(t,l)=u2, u(0,x)=u1+(u2-u1)x/l+a.sin(n[tex]\pi[/tex]x/l); b) in the semi-plane x > 0, with u(t,0)=u0+a.sin([tex]\omega[/tex]t). 2. Relevant equations Wish I knew... 3. The attempt at a solution I haven't done none because I don't know where to start. I just want to ask what should I study to solve this problem. I have Riley's "Mathematical Methods for Physics and Engineering" and Zill's "Advanced Engineering Mathematics". If you have and can point me out the chapters, I would be much appreciated, or you can just tell me the subjects, that I'll try and look for them in the books.