ABSTRACT
In this chapter we give a short introduction into multigrid methods for twoand three-dimensional problems including systems of equations. For a detailed description we refer to the literature, e.g., [7, 28, 62, 65]. Here, our main focus is to describe the multigrid components which can be selected in the accompanying software LFA. Sections 3.1 and 3.2 are for those readers who are not yet familiar with multigrid principles. In Sections 3.3, 3.4, and 3.5, the implemented multigrid components of LFA are detailed and it is explained how to select them via the graphical user interface xlfa.
