3 papers
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…
math.CA2001
Nonlinear Sequence Transformations: Computational Tools for the Acceleration of Convergence and the Summation of Divergent Series
Ernst Joachim Weniger
Convergence problems occur abundantly in all branches of mathematics or in the mathematical treatment of the sciences. Sequence transformations are principal tools to overcome conv…