Differential equations, Partial Équations aux dérivées partielles Numerical analysis Analyse multiéchelle Boundary value problems for second-order elliptic equations Controllability Controllability, observability, and system structure Dependence of solutions on initial and boundary data, parameters Elliptic equations and systems Finite difference methods Fluid mechanics Foundations, constitutive equations, rheology Hyperbolic equations and systems Image processing Initial-boundary value problems for higher-order parabolic equations Inverse problems Laplacian operator, reduced wave equation (Helmholtz equation), Poisson equation Liquid crystals Mathematics Mathématiques Miscellaneous topics Multiscale modeling Numerical methods in Fourier analysis Parabolic equations and systems Partial differential equations Partial differential equations, initial value and time-dependent initial-boundary value problems Qualitative properties of solutions Signal processing Systems theory; control Traitement d'images