Answer Happy

Mark each of the following statements as true or false. 1. (2%) The eigenfunctions of Helmholtz's equation on the surface of a sphere are called spher- ical harmonics. 2. (2%) It has been proved that finding a general closed-form solution to Bessel's equation is impossible. 3. (2%) If one knows a temperature profile u (x,t) for some t > 0, it is possible to run the heat equation "backwards in time" to recover the initial temperature profile u (t,0). 4. (2%) If one knows a displacement profile u (x, t) and velocity profile u: (x, t) for some t > 0, it is possible to run the wave equation “backwards in time” to recover the initial displace- ment and velocity u (x,0) and u: (x,0). 5. (2%) It is impossible for a solution to the Laplace equation Uxx + Uyy = 0 to have a local maximum or minimum in the interior of the problem domain.