Youn-Seo Choi

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Let X be a Banach space on which a discrete group Γ acts by isometries. For certain natural choices of X, every element of the group algebra, when regarded as an operator on X, has empty residual spectrum. We show, for instance, that this occurs if X is l2(Γ) or the group von Neumann algebra VN(Γ). In our approach, we introduce the notion of a surjunctive(More)
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