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A half-line of Schur idempotent norms

Rupert H. Levene

math.FAarXiv:2611.08419

Abstract

Using a family of bipartite graphs constructed by hanging identical rooted trees at every vertex of a highly symmetric graph, we show that every sufficiently large real number is the norm of an idempotent Schur multiplier on the bounded operators on 2. This answers a question previously raised by the author.

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