Important information about Elliptic boundary value problem
(lap) means the Laplacian
Vrr means the second derivative of V with respect to r
V(theta theta) means the second derivative of V with respect to theta
Solve:
(lap)V(r,theta)= Vrr+(1/r)Vr+(1/r^2)V(theta theta)=0
0 < r < 1, -(pi) < theta < pi
V(1,theta) = {1, -(pi/2) < theta < (pi/2)
{0, elsewhere