Teh del operator is:

d/dx x^ + d/dy y^ + d/dz z^

In spherical coordinates it is:

d/dr r^ + phi^/(r*sin(theta)) d/dphi + theta^/r d/dtheta

The del^2 operator in spherical coordinates is:

1/r d^2/dr^2 (r Psi) + 1/(r^2 sin(theta)) d/dtheta(sin(theta) dPsi/dtheta) +1/(r^2 *sin^2(theta)) (d^2 Psi)/dphi^2

dot(del, r^)=2/r