Introduction to Isospectrality

Alberto Arabia is a specialist in cohomological theories, especially Equivariant Cohomology and p-adic Cohomology. His publications in Equivariant Cohomology include the book Equivariant Poincaré Duality on G-Manifolds (Lecture Notes in Mathematics 2288, Springer 2021), while in p-adic Cohomology he succeeded with Zoghman Mebkhout in the globalization of the Monsky–Washnitzer cohomology (2010). He has also conducted important research in the field of Configuration Spaces (Mémoires de la SMF 170, 2021).

“This book is accessible to third year university students, which describes a complete and elegant solution to a long-standing mathematical problem.” (Bo Liu, zbMATH 1505.58001, 2023)

• 1 Introduction.- 2 The Wave Equation on Flat Manifolds.- 3 The Sunada–Bérard–Buser Method.- 4 The Gordon–Webb–Wolpert Isospectral Domains.- A Linear Representations of Finite Groups and Almost-Conjugate Subgroups.- B The Laplacian as Isometry-Invariant Differential Operator.- C The Path-Distance on a Hausdorff Connected Flat Manifold.- D Group Quotients of Flat Manifolds.- References.- Glossary.- Index.