Hello, guys.

I'm having this assignment in one of my school subjects, but I just can't get it right:

"Program Cauchy's problem for the heat conduction equation on the circle S = {x mod 2*Pi}

u_t = u_xx , u(0, x) = Phi(x), t > 0, x belongs to S

in Fourier series. Illustrate the solution using 2Dplot."