Let 'E' = element of

a) Suppose that u 'E' C^2*(D) ∩ C(D ̅) is harmonic inside a bounded and connected region D. Shoe that if u(x) for some point x* 'E' D then u(x) is a constant.

b) Suppose that u 'E' C^2 is harmonic on all of R^n explain why (delta u)/(delta xI) is also harmonic on R^n