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The Dirichlet-Jordan test and multidimensional extensions
Authors:Michael Taylor
Institution:Department of Mathematics, University of North Carolina, Chapel Hill, North Carolina 27599-3902
Abstract:

If $\mathcal{F}$ is a foliation of an open set $\Omega\subset \mathbb{R}^n$ by smooth $(n-1)$-dimensional surfaces, we define a class of functions $\mathcal{B}(\Omega,\mathcal{F})$, supported in $\Omega$, that are, roughly speaking, smooth along $\mathcal{F}$ and of bounded variation transverse to $\mathcal{F} $. We investigate geometrical conditions on $\mathcal{F}$ that imply results on pointwise Fourier inversion for these functions. We also note similar results for functions on spheres, on compact 2-dimensional manifolds, and on the 3-dimensional torus. These results are multidimensional analogues of the classical Dirichlet-Jordan test of pointwise convergence of Fourier series in one variable.

Keywords:Fourier series  Dirichlet-Jordan test  Gibbs phenomenon
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