Abstract
Let ℘(D) and R(D) be two convolution operators in ℓn and K be an arbitrary compact subset of ℝn, having interior points. Necessary and sufficient conditions are given for the boundedness and compactness of the ball
in the metric of\(\left\| {\mathcal{R}\left( D \right)u} \right\|_{L^ \propto \left( K \right)} \).
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Literature cited
L. Hörmander, Linear Partial Differential Operators [Russian translation], Mir, Moscow (1965).
Additional information
Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 73, pp. 211–216, 1977.
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Maz'ya, V.G. Local square summability of convolutions. J Math Sci 34, 2148–2152 (1986). https://doi.org/10.1007/BF01741591
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DOI: https://doi.org/10.1007/BF01741591