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101111001101
101111001101 is offline
#7
Aug20-11, 05:33 PM
P: 7
[tex]\nabla.\phi = \frac{\partial \phi_x}{\partial x} + \frac{\partial \phi_y}{\partial y}+\frac{\partial \phi_z}{\partial z}[/tex]

It looks like the dot product of [tex]\frac{\partial}{\partial x} +\frac{\partial}{\partial y} + \frac{\partial}{\partial z}[/tex] and [tex](\phi_x,\phi_y,\phi_z)[/tex].

It's an abuse of notation.