Uniform Continuity and Brézis-Lieb Type Splitting for Superposition Operators in Sobolev Space

preprint2016arXivOpen access

Abstract

Using concentration-compactness arguments we prove a variant of the Brezis-Lieb-Lemma under weaker assumptions on the nonlinearity than known before. An intermediate result on the uniform continuity of superposition operators in Sobolev space is of independent interest.

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