Algebraic and geometric presentations of algebraic groups over local fields

Mathematical billiards and flows on surfaces

Spectral stability estimates for the Laplace operator with either Dirichlet or Neumann boundary conditions

A mixed finite element method with exactly divergence-free velocities for incompressible magnetohydrodynamics

Adjoint methods for gradient-based optimization of oil recovery

Well-behaved separating algebras

Classification of solutions of the radial energy-critical wave equation

About the mathematical derivation of Ohm's law

A posteriori error analysis for optimal control problems governed by partial differential equations

Endomorphisms of Varieties (joint work with Rafael Andrist)