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Integral estimate in the Levitan's paper "On expansion in eigenfunctions of the Laplace operator"

Let $D \subset R^m$ be a domain in a $m$-dimensional Euclidean space, $P \in intD$, and $t > 0$ so small that the sphere of radius $t$ centered at the point $P$ sits in $intD$. Let $\phi : D \...
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