Spectral isometries
In this survey, we summarise some of the recent progress on the structure of spectral isometries between C*-algebras.
In this survey, we summarise some of the recent progress on the structure of spectral isometries between C*-algebras.
For a bounded linear operator T in a Banach space the Ritt resolvent condition (|λ| > 1) can be extended (changing the constant C) to any sector |arg(λ - 1)| ≤ π - δ, . This implies the power boundedness of the operator T. A key result is that the spectrum σ(T) is contained in a special convex closed domain. A generalized Ritt condition leads to a similar localization result and then to a theorem on invariant subspaces.
In this paper we suggest a general framework of the spectral mapping theorem in terms of parametrized Banach space bicomplexes.
We investigate the weak spectral mapping property (WSMP) , where A is the generator of a ₀-semigroup in a Banach space X, μ is a measure, and μ̂(A) is defined by the Phillips functional calculus. We consider the special case when X is a Banach algebra and the operators , t ≥ 0, are multipliers.