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- W2012285865 abstract "In recent work the author stated an inequality of Hausdorίϊ-Young type for integral operators which proved to be useful in obtaining Lp estimates on certain locally compact unimodular groups. The present paper is devoted to a closer analysis of that inequality together with some applications to operator theory and to Lp-Fourier analysis on locally compact groups. In the first place, the proof given previously in [15 I], for the inequality is incomplete, so this paper will begin in §2 with a correct proof of the inequality (Theorem 1). Also shown in §2 is the nonexistence of extremal functions in a particular instance (Prop. 8). In §3 the results of §2 are applied to obtain estimates for the norm of the Lp-Fourier transform on certain unimodular groups. Here some of the machinery from [10] is used in the examples, one class of which (Prop. 13) does not depend on Theorem 1. This has happened before, see [151: §3]. For certain members of this class however, it is shown that a better estimate can be obtained using Theorem 1 (Prop. 15). In §4 the study of Hausdorff-Young inequalities on nonunimodular groups is initiated. In view of the recent work on Plancherel formulas for nonunimodular groups such inequalities with constant 1 might be considered routine. It is shown here using Theorem 1, that the natural Hausdorfϊ-Young inequality on the ax + 6 group has a constant less than 1 (Prop. 19). In §5 an operator valued analog of the Fourier transform on Abelian groups is introduced, which is motivated by preceding sections, and it is shown, using Theorem 1, that it behaves in some respects like the Fourier transform (Prop. 20)." @default.
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- W2012285865 date "1977-01-01" @default.
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- W2012285865 title "On the Hausdorff-Young theorem for integral operators" @default.
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- W2012285865 doi "https://doi.org/10.2140/pjm.1977.68.241" @default.
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