A refinement of Chang's lemma that adds cosetwise l1 control on correlations outside the large spectrum subspace, producing a localized counting lemma for subsets of finite abelian groups.
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A strengthening of Chang's lemma
A refinement of Chang's lemma that adds cosetwise l1 control on correlations outside the large spectrum subspace, producing a localized counting lemma for subsets of finite abelian groups.