since this applies at any point in space.
The calculation of the divergence of a vector A is therefore very simple since all that are required are the spatial
derivatives of the scalar components of the vector. The divergence is a scalar as required and may have any magnitude,
including zero. The result in Eq. (2.70) well justifies the two pages of algebra that were needed to obtain it because now we
have a simple, systematic way of evaluating the divergence. For historical reasons, the notation for divergence is ∇A
(read: del dot A).1 The divergence of vector A is written as follows: