Browsing Institut für Mathematik by Title
Now showing items 62-81 of 329
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1997-01-27BuchCurves in P3 with good restriction of the tangent bundle Restriction of a stable vector bundle on a variety to a subvariety does not always preserves stability. Here we consider this situation for the P3 the tangent bundle E of the projective space and its restriction to space ...
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2000-03-28BuchCyclotomic Curve Families over Elliptic Curves with Complete Picard-Einstein Metric According to a problem of Hirzebruch we look for models of biproducts of elliptic CM-curves with Picard modular structure. We introduce the singular mean value of crossing elliptic divisors on surfaces and determine its ...
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2005-11-02BuchDecoding of codes on Picard curves The Picard curves are genus three curves with a non trivial automorphism, which have been intensively studied due their connection with interesting number theoretic problems. In 1989, R. Pellikaan obtained an algorithm ...
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2005-10-20BuchDecomposition of a Multi-Stage Stochastic Programfor Power Dispatch We develop a multi-stage stochastic program for the optimal dispatch of electric power under uncertain demand in a generation system comprising thermal and pumped storage hydro plants. Based on an abstract duality argument ...
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2005-11-02BuchDelay differential equations driven by Lévy processes: stationarity and Feller properties We consider a stochastic delay differential equation driven by a general Lévy process. Both, the drift and the noise term may depend on the past, but only the drift term is assumed to be linear. We show that the segment ...
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1996-11-01BuchDensely defined selections of set-valued mappings and applications to the geometry of Banach spaces and optimization
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2005-11-02BuchDifferentiable Selections of Set-Valued Mappings With Application in Stochastic ProgrammingWe consider set-valued mappings defined on a linear normed space with convex closed images in IRn. Our aim is to construct selections which are (Hadamard) directionally differentiable using some approximation of the ...
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2005-11-16BuchDifferentiable Selections of Set-Valued Mappings and Asymptotic Behavior of Random Sets in Infinite Dimensions We consider set-valued mappings acting between two linear normed spaces and having convex closed images. Our aim is to construct selections with directional differentiability properties up to the second order, using certain ...
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2005-11-07BuchDifferential algebraic systems anew Linear differential algebraic equations with properly stated leading term are considered via a decoupling into their essential parts. It is shown why for so-called numerically well formulated equations the decoupling and ...
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2005-11-04BuchDifferential Algebraic Systems with Properly Stated Leading Term and MNA Equations Differential algebraic equations with properly stated leading term are equations of the form A(x(t),t)(d(x(t),t))'+b(x(t),t)=0 with in some sense well-matched coefficients. Systems resulting from the modified nodal analysis ...
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2005-11-02BuchDifferential Stability of Two-Stage Stochastic Programs Two-stage stochastic programs with random right-hand side are considered. Optimal values and solution sets are regarded as mappings of the expected recourse functions and their perturbations, respectively. Conditions are ...
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2011-08-11BuchDiscontinuous Galerkin Finite Element Convergence for Incompressible Miscible Displacement Problems of Low Regularity In this article we analyse the numerical approximation of incompressible miscible displacement problems with a combined mixed finite element and discontinuous Galerkin method under minimal regularity assumptions. The main ...
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2006-05-18BuchDiscretisation and Solver Methods for a Model for Solid-Gas-Phase of a Crystal Growth Apparatus. We present discretisation and solver methods for a model for a solid-gas phase of a crystal growth aparatus. The model-equations are coupled Eulerian- and Heat-transfer-equations with flux-boundary conditions. For more ...
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2009-07-02BuchDiscretization methods with analytical characteristic methods for advection-diffusion-reaction equations and 2d applications Our studies are motivated by a desire to model long-time simulations of possible scenarios for a waste disposal. Numerical methods are developed for solving the arising systems of convection-diffusion-dispersion-reaction ...
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2006-01-01BuchDiscretization methods with analytical solutions for a convection-diffusion-dispersion-reaction-equation and applications in 2D and 3D for waste-scenarios In this part we describe the numerical methods and the results for our discretization methods for system of convection-diffusiondispersion-reaction equation. The motivation came for the simulation of a scenario of a ...
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2011-08-11BuchDiscretization methods with analytical solutions for a convection-reaction equation with higher-order discretizations We introduce an improved second-order discretization method for the convection-reaction equation by combining analytical and numerical solutions. The method is derived from Godunov's scheme, see [Godunov 1959] and [Leveque ...
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2006-01-01BuchDiscretization-Optimization Methods for Nonlinear Elliptic Optimal Control Problems with State Constraints We consider an optimal control problem described by a second order elliptic boundary value problem, jointly nonlinear in the state and control, with control and state constraints, where the state constraints and cost ...
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2006-01-01BuchDiscretization-Optimization Methods for Nonlinear Elliptic Relaxed Optimal Control Problems with State Constraints. We consider an optimal control problem described by a second order elliptic boundary value problem, jointly nonlinear in the state and control with high monotone nonlinearity in the state, with control and state constraints, ...
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2006-01-01BuchDiscretization-Optimization Methods for Nonlinear Parabolic Relaxed Optimal Control Problems with State Constraints We consider an optimal control problem described by a semilinear parabolic partial differential equation, with control and state constraints, where the state constraints and cost involve also the state gradient. Since this ...
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1997-10-27BuchDuality Construction of Moduli Spaces
