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Paper detail

Revisiting the Rellich inequality

We revisit the Rellich inequality from the viewpoint of isolating the contributions from radial and spherical derivatives. This naturally leads to a comparison of the norms of the radial Laplacian and Laplace{Beltrami operators with the standard Laplacian. In the case of the Laplace{ Beltrami operator, the three-dimensional case is the most subtle and here we improve a result of Evans and Lewis by identifying the best constant. Our arguments build on certain identities recently established by Wadade and the second and third authors, along with use of spherical harmonics.

preprint2022arXivOpen access
Neal BezShuji MachiharaTohru Ozawa
math.FA
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Neal BezShuji MachiharaTohru Ozawa

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