Be in cylindrical coordinates
taken as orthonormal basis vectors. Their derivatives are:
Here, as in the following, an index after a comma means a derivative according to the specified coordinate, for example
the application of the Laplace operator
to a vector field results in:
i.e. the formula specified in the text.
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The basis vectors
be used. These vectors gave the derivatives
Application of the Laplace operator
to a vector field:
thus the same result as given in the text.
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