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Operator theory --- Scattering (Mathematics) --- Linear systems. --- Operator algebras. --- Hilbert space. --- Dispersion (mathématiques) --- Systèmes linéaires. --- Algèbres d'opérateurs --- Hilbert, Espaces de --- Hilbert space --- Linear systems --- Operator algebras --- Scattering theory (Mathematics) --- Boundary value problems --- Differential equations, Partial --- Scattering operator --- Algebras, Operator --- Topological algebras --- Systems, Linear --- Differential equations, Linear --- System theory --- Banach spaces --- Hyperspace --- Inner product spaces --- Algèbres d'opérateurs. --- Hilbert, Espaces de.

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The present volume is dedicated to modern topics of the theory of hyperbolic equations such as evolution equations, multiple characteristics, propagation phenomena, global existence, influence of nonlinearities. It is addressed to beginners as well as specialists in these fields. The contributions are to a large extent self-contained. Key topics include: - low regularity solutions to the local Cauchy problem associated with wave maps; local well-posedness, non-uniqueness and ill-posedness results are proved - coupled systems of wave equations with different speeds of propagation; here pointwise decay estimates for solutions in spaces with hyperbolic weights come in - damped wave equations in exterior domains; the energy method is combined with the geometry of the exterior domain; for the critical part of the boundary a restricted localized effective dissipation is employed - the phenomenon of parametric resonance for wave map type equations; the influence of time-dependent oscillations on the existence of global small data solutions is studied - a unified approach to attack degenerate hyperbolic problems as weakly hyperbolic ones and Cauchy problems for strictly hyperbolic equations with non-Lipschitz coefficients - weakly hyperbolic Cauchy problems with finite time degeneracy; the precise loss of regularity depending on the spatial variables is determined; the main step is to find the correct class of pseudodifferential symbols and to establish a calculus which contains a symmetrizer.

Differential equations, Hyperbolic. --- Differential equations --- Schrödinger operator. --- Scattering (Mathematics) --- Pseudodifferential operators. --- Qualitative theory. --- Operators, Pseudodifferential --- Pseudo-differential operators --- Operator theory --- Scattering theory (Mathematics) --- Boundary value problems --- Differential equations, Partial --- Scattering operator --- Operator, Schrödinger --- Differential operators --- Quantum theory --- Schrödinger equation --- 517.91 Differential equations --- Hyperbolic differential equations --- Global analysis (Mathematics). --- Differential equations, partial. --- Operator theory. --- Functional analysis. --- Analysis. --- Partial Differential Equations. --- Operator Theory. --- Functional Analysis. --- Functional calculus --- Calculus of variations --- Functional equations --- Integral equations --- Functional analysis --- Partial differential equations --- Analysis, Global (Mathematics) --- Differential topology --- Functions of complex variables --- Geometry, Algebraic --- Mathematical analysis. --- Analysis (Mathematics). --- Partial differential equations. --- 517.1 Mathematical analysis --- Mathematical analysis