Ultrametric Banach Algebras by Alain Escassut (PDF)

Description

In this book, ultrametric Banach algebras are studied with the help of topological considerations, properties from affinoid algebras, and circular filters which characterize absolute values on polynomials and make a nice tree structure. The Shilov boundary does exist for normed ultrametric algebras.In uniform Banach algebras, the spectral norm is equal to the supremum of all continuous multiplicative seminorms whose kernel is a maximal ideal. Two different such seminorms can have the same kernel. Krasner-Tate algebras are characterized among Krasner algebras, affinoid algebras, and ultrametric Banach algebras. Given a Krasner-Tate algbebra A=K{t}[x], the absolute values extending the Gauss norm from K{t} to A are defined by the elements of the Shilov boundary of A.

User’s Reviews

Editorial Reviews: Review It will be of interest to researchers in non-archimedean analysis. — Studia Universitatis Babes-Bolyai, Series MathematicaTechniques based on affinoid algebras and ultrametric Banach algebras considered together, something not seen in any other book. — Mathematical Reviews

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