The harmonic product of $δ(x_{1},..., x_{n})$ and $δ(x_{1})$ and two combinatorial identities

Mathematics – Functional Analysis

Scientific paper

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Latex. To appear in Hiroshima Math. J

Scientific paper

In the framework of nonstandard analysis, Bang-He Li and the author defined the product of any two distributions on $R^n$ via their harmonic representations. The product of $\delta (x_{1},..., x_{n})$ and $\delta (x_{1})$ was calculated by Kuribayashi and the author in [LK]. In this paper, the result of [LK] is improved to $$\delta (x_{1},..., x_{n})\circ \delta (x_{1}) =\dfrac{1}{2\pi\rho} \delta (x_{1},..., x_{n}) {mod} {infinitesimals}$$ where $\rho$ is a positive infinitesimal. Moreover two combinatorial identities are obtained as byproducts.

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