PROCEEDINGS OF THE SEVENTH INTERNATIONAL COLLOQUIUM ON DIFFERENTIAL EQUATIONS : plovdiv, ... bulgaria, 18-23 august, 1996

In der 1958 gegründeten Schriftenreihe des Instituts für Zeitungsforschung erscheinen wissenschaftliche Arbeiten zu den Kernthemen des Instituts, der Entwicklung der Printmedien und des Journalismus. Die Beiträge greifen historische und aktuelle medien- und kommunikationswissenschaftliche Themen und Fragestellungen auf. Die Reihe umfasst Monographien und Sammelbände sowie Nachschlagewerke, Biografien und Textdokumentationen. CONTENTS Preface Identifying the Jordan canonical form and associated non-singular transformations Forward dynamic programming for the numerical solution of parabolic control problems Optimal control of Goursat systems over varying domains On Newton's problem under side constraints Parameters estimation of some electro-elasticity models A nonlinear suspension bridge equation Uniqueness in the Cauchy problem for the heat equation Existence and uniqueness of solutions for a class of abstract nonlinear wave equation Asymptotic expansions for some classical operators and their use in approximation theory Some over-determined boundary-value problems for hyperbolic equations On asymptotic properties in a neighbourhood of infinity of solutions of elliptic equations Further development of minimum curvature multi-step quasi-Newton methods Some results about boundary conditions for a discrete model in elasticity On local and global solvability of nonlinear mixed problems modelling vibrations of a string Poincare-Bendixson type theorems for n dimensional spaces The effect of heterogeneity in sharing rates and choice of shooting gallery on the spread of HIV amongst sharing injecting drug users Nontrivial solutions for a fourth order O.D.E. with singular boundary conditions The limiting problem in a double free boundary problem On a Lienard system with three equilibrium points Re-examination on validity of analytic solution of Bessel's equation to estimate the magnitude of fluctuation of stem wood temperature in standing Pinus densiflora trees Some modernizations the Gronwall-Bellman Lemma and its application to differential equations with delay Numerical analysis of pseudozeros and pseudospectra Characterization of the holomorphy of infinite dimensional domains by Oka's principle Numerical analysis on 8-problem and extension of holomorphic functions from lower dimensional subvarieties On triple systems and Yang-Baxter equations On continuation of Gevrey class solutions of linear partial differential equations Convergence properties of periodic solutions on a piecewise linear differential equation Norm estimates for Schrodinger semigroups with magnetic fields On linear differential equations for fractional order Differentiability for nonlinear parabolic systems Extension of holomorphic mappings into manifolds with weak disc property Global instability of natural convection in an elliptic cavity, using a Fourier spectral difference method Capacity associated with an a-parabolic operator Martin Boundary at Infinity for the Heat Equation A general form of a mean value property for poly-temperatures on a strip domain Cohomology vanishing and q-convex functions on infinite dimensional domains The existence and the continuation of holomorphic solutions for convolution equations in a half-space in Cn Solvability and propagation of singularities for some class of microdifferential equations in the spaces of micro-distributions Rapidly varying behaviour of the solutions of a second order linear differential equation Stability of Lie groups of the perturbed non-linear wave equation Application of weighted ranking methods for tie-break simulations Chaotic mixing of viscous fluids: a marangoni-convection-driven example Numerical solutions to the minimum-time problem for linear second-order conflict-controlled systems Nonlinear thermoelasticity and symmetry Saddle point methods in spatial models of biological systems The asymptotic spatial behaviour of a class of epidemic models A generalized diffusion equation Analysis of a degenerate Hopf bifurcation in a PID controlled CSTR On the arithmetic properties of the modular function induced from the hypergeometric differential equation of type (3,6) Caloric morphisms and a generalization of the Appell transformation Boundary behaviors of some families of special functions On a coordinate transformation to express an explicit duck solution in the FitzHugh-Nagumo equation On the completeness of the eigenfunctions of elliptic operators An algorithm for high accuracy product in redundant representation Round-off errors in floating-point solutions for Chebyshev collocation points Identification of density distribution due to one-codimensional projected figures Differential inequalities concerning nonlinear systems Decay for some second order nonlinear systems On a priori bound for nonconvolutional integral equations A pointwise error estimate for distributed parameter identification