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By Audrey Terras. Audrey Terras is Professor of Mathematics at the University of California, San Diego. Author Audrey Terras. Introduction; Cast of characters; Part I: 1. Selberg's trace formula and isospectral non-isomorphic graphs; 2.9 The trace formula on finite upper half planes; 2.10 The trace formula for a tree and Ihara's zeta function.
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