2017 | OriginalPaper | Buchkapitel
Koopman Semigroups
verfasst von : András Bátkai, Marjeta Kramar Fijavž, Abdelaziz Rhandi
Erschienen in: Positive Operator Semigroups
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We present here a class of positive operator semigroups that arise in studying dynamical systems. The main idea is to linearize a given (nonlinear) system by considering another state space. The linear operator which acts on this new space is called the Koopman operator. It is named after B. O. Koopman, who used this in the 1930s together with G. D. Birkhoff and J. von Neumann to prove the so-called ergodic theorems.