Uniqueness Theorems for Point Source Expansions: DIDACKS V

Details Uniqueness Theorems for Point Source Expansions: DIDACKS V Uniqueness Theorems for Point Source Expansions: DIDACKS V

2008-04-28

arxiv.org/abs/0804.4436v1

Physics

Mathematical Physics

23 pages. Last article of this series

Scientific paper

Finite collections of point masses contained in some bounded domain produce a unique field in the exterior domain, which means that the associated basis functions (often called ``fundamental solutions'') are independent. A new proof of this result is given in this paper that can be generalized to other finite combinations of point source distributions. For example, this paper shows in $\mathbb{R}^3$ that a finite combination of point dipoles produces a unique field. The strategy employed in the paper is to develop results for analytic functions in the complex plane and then carry them over to harmonic functions in the real plane, and from there to harmonic functions in $\mathbb{R}^3$. More results are shown for $\mathbb{R}^2$ and for $\mathbb{C}$ than are shown for more general settings. For example, in the complex plane, the paper shows that a finite combination of higher order poles of any order in the interior of a unit disk always corresponds to a unique analytic function in the exterior of a unit disk.

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