Algebraic Multigrid with Overlapping Schwarz Smoothers and Local Spectral Coarse Grids for Least Squares Problems

Ben S. Southworth, Hussam Al Daas, Golo A. Wimmer +1

This paper develops a new algebraic multigrid (AMG) method for sparse least-squares systems of the form $A=G^{T}G$ motivated by challenging applications in scientific computing where…