TY - GEN A1 - Gräser, Carsten A1 - Kornhuber, Ralf T1 - Multigrid Methods for Obstacle Problems N2 - In this review, we intend to clarify the underlying ideas and the relations between various multigrid methods ranging from subset decomposition, to projected subspace decomposition and truncated multigrid. In addition, we present a novel globally convergent inexact active set method which is closely related to truncated multigrid. The numerical properties of algorithms are carefully assessed by means of a degenerate problem and a problem with a complicated coincidence set. Y1 - 2008 UR - https://opus4.kobv.de/opus4-matheon/frontdoor/index/index/docId/511 UR - https://nbn-resolving.org/urn:nbn:de:0296-matheon-5116 ER -