Equality of uniform and Carleman spectra for bounded measurable functions

Abstract

In this paper we study various types of spectra of functions $\phi:\jj\to X$, where $\jj\in\{\r_+,\r\}$ and $X$ is a complex Banach space. We show that uniform spectrum defined in [15] coincides with Carleman spectrum for $\phi\in L^{\infty}(\r,X)$. This result holds true also for Laplace (half-line) spectrum for $\phi\in L^{\infty}(\r_+,X)$. We also indicate a class of bounded measurable functions for which Laplace spectrum and Carleman spectrum are equal