Added by Schroedinger's Cat on April 27, 2000 at 20:46:07:
Ñ^2V = (1/r^2)¶/¶r(r^2*¶V/¶r) + (1/r^2*sin(theta))¶/¶(theta)(sin(theta)¶V/¶(theta)) + (1/r^2*sin^2(theta))¶^2V/¶(phi)^2