ADAPTIVE SPECTRAL GALERKIN METHODS WITH DYNAMIC MARKING

摘要

The convergence and optimality theory of adaptive Galerkin methods is almost exclusively based on the Dorfler marking. This entails a fixed parameter and leads to a contraction constant bounded below away from zero. For spectral Galerkin methods this is a severe limitation which affects performance. We present a dynamic marking strategy that allows for a superlinear relation between consecutive discretization errors, and show exponential convergence with linear computational complexity whenever the solution belongs to a Gevrey approximation class.