The Laplacian of a scalar field f (x, y, z) is the divergence of
∇f and is written
∇2f
=
∇⋅ 6pt∇f
=
∇⋅,, 6pt
=
+ +
The default is that the field variables are x, y, and z, in that
order. If you wish to label the field variables differently, reset the
default with Set Basis Variables on the Vector Calculus
submenu.