Optimal Young's inequality and its converse:a simple proof

preprint1997arXivOpen access

Abstract

We give a new proof of the sharp form of Young's inequality for convolutions, first proved by Beckner [Be] and Brascamp-Lieb [BL]. The latter also proved a sharp reverse inequality in the case of exponents less than 11. Our proof is simpler and gives Young's inequality and its converse altogether.

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