Joint spectral characteristics describe the stationary behavior of a discrete time linear switching system. Well, that’s what an electrical engineer would say. A mathematician would say that they characterize the asymptotic behavior of a semigroup of matrices, and a computer scientist would perhaps see them as describing languages generated by automata. Work supported by the Communauté française de Belgique - Actions de Recherche Concertées, and by the Belgian Programme on Interuniversity Attraction Poles initiated by the Belgian Federal Science Policy Office.
Jungers, R. (2013). Joint Spectral Characteristics: A Tale of Three Disciplines. Developments in Language Theory : Lecture Notes in Computer Science, p. 27-28. https://doi.org/10.1007/978-3-642-38771-5_3