2022/03/18 by Niklas Angleitner, Markus Faustmann, Jens Markus Melenk · 1 voice
Mathematics · #math.NA
paper · pdf · doi:10.1016/j.camwa.2022.11.011
In our previous works, we proved that the inverse of the stiffness matrix of an h-version finite element method (FEM) applied to scalar second order elliptic boundary value problems can be approximated at an exponential rate in the block rank by H-matrices. Here, we improve on this result in multiple ways: (1) The class of meshes is significantly enlarged and includes certain exponentially graded meshes. (2) The dependence on the polynomial degree p of the discrete ansatz space is made explicit in our analysis. (3) The bound for the approximation error is sharpened, and (4) the proof is simplified.