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In this paper, we study the linear wave equation on an n-dimensional spatial domain. We show that there is a boundary triplet associated to the undamped wave equation. This enables us to characterise all boundary conditions for which the undamped wave equation possesses a unique solution non-increasing in the energy. Furthermore, we add boundary inputs and outputs to the system, thus turning it into an impedance conservative boundary control system.
We study integro-differential inclusions in Hilbert spaces with operator-valued kernels and give sufficient conditions for the well-posedness. We show that several types of integro-differential equations and inclusions are covered by the class of evolutionary inclusions, and we therefore give criteria for the well-posedness within this framework. As an example, we apply our results to the equations of visco-elasticity and to a class of nonlinear integro-differential inclusions describing phase transition phenomena in materials with memory.
Abstract. A well-posedness result for a time-shift invariant class of evolutionary operator equations involving material laws with fractional time-integrals of order α ∈ ]0, 1[ is considered and exemplified by an application to a Kelvin-Voigt type model.
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