MS FT-2-2 7 Orthogonal polynomials and quadrature: Theory, computation, and applications

Quadrature rules find many applications in science and engineering. Their analysis is a classical area of applied mathematics and continues to attract considerable attention. This seminar brings together speakers with expertise in a large variety of quadrature rules. It is the aim of the seminar to provide an overview of recent developments in the analysis of quadrature rules. The computation of error estimates and novel applications also are described

A gauge invariant discretization on simplicial grids of the Schrödinger eigenvalue problem in an electromagnetic field

We propose a method to compute approximate eigenpairs of the Schrödinger operator on a bounded domain in the presence of an electromagnetic field. The method is formulated for the simplicial grids that satisfy the discrete maximum principle. It combines techniques from lattice gauge theory and finite element methods, retaining the discrete gauge invariance of the former but allowing for non-congruent space elements as in the latter. The error in the method is studied in the framework of Strang's variational crimes, comparing with a standard Galerkin approach. For a smooth electromagnetic field the crime is of order the mesh width h, for a Coulomb potential it is of order h|log h|, and for a general finite energy electromagnetic field it is of order h1/2