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math-ph2005
The Spherical Tensor Gradient Operator
Ernst Joachim Weniger
The spherical tensor gradient operator , which is obtained by replacing the Cartesian components of by the Cartesian components of $\nab…
math-ph2001
Addition Theorems as Three-Dimensional Taylor Expansions. II. Functions and Other Exponentially Decaying Functions
Ernst Joachim Weniger
Addition theorems can be constructed by doing three-dimensional Taylor expansions according to $f (\mathbf{r} + \mathbf{r}') = \exp (\mathbf{r}' \cdot \mathbf{\nabla}) f (\mathbf{r…