Variations on the Theme of Journe's Lemma
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🧮 math.CA
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lemmasomejournearticlechangcomponentcriticaldifferent
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Journe's Lemma is a critical component of many questions related to the product ${BMO}$ theory of S.-Y. Chang and R. Fefferman. This article presents several different variants of the Lemma, some known, some implicit in the literature, and some new.
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