- #1

yungman

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I am confuse. According to multi-variables calculus, the [itex] \nabla[/itex] operator is spatial derivative of either a scalar or a vector field. Both of which are point form...which is absolutely spatial dependent only. I don't see what is the meaning respect to source or field points.

For example:

[itex]\nabla V [/itex] is the gradient of a scalar function V, and it has a different value at each individual point specified. So is [itex]\nabla \cdot \vec E[/itex] which is the divergence at a point in the space. These are regardless of whether it is a field or a source point.

I am confused. Please explain to me.

Thanks

Alan