publications Bloch, Breu, Frommer, Heybrock, Schäfer, Wettig; Short-recurrence Krylov subspace mthods for the overlap Dirac operator at nonzero chemical potential; 2009; arXiv:0910.1048v1 [hep-lat] Bloch, Breu, Frommer, Heybrock, Schäfer, Wettig; Krylov subspace methods and the sign function: multishifts and deflation in the non-Hermitian case; 2009; arXiv:0910.2927v1 [hep-lat] Schäfer; Krylov subspace methods for shifted unitary matrices and eigenvalue deflation applied to the Neuberger Operator and the matrix sign function; Doctoral thesis; 2008; elektronische Publikation Krieg, Eshof, Frommer, Lippert, Schäfer; Improving inversions of the overlap operator; Nucl. Phas. Proc. Suppl., 140; 2005; arXiv:hep-lat/0409030v1 Cundy, Eshof, Frommer, Krieg, Lippert, Schäfer; Numerical Methods for the QCD Overlap Operator: III. Nested Iterations; May 2004; Preprint Arnold, Cundy, Eshof, Frommer, Krieg, Lippert, Schäfer; Numerical Methods for the QCD Overlap Operator: II. Optimal Krylov Subspace Methods; November 2003; Preprint Schäfer; Krylov-Unterraumverfahren für die Matrix-Signum-Funktion; Diplomarbeit, 2002

matlab files QCD matrices: Matrix Market Download Code for the 'Optimal Krylov Subspace Methods' paper (minres, cgne, sumr) Download Code for the 'Nested Iterations' paper (CG, relCG, relGMRESR(CG))

events Joint Seminar with the Applied Mathematics Group of the University of Düsseldorf

related publications see the Applied Computer Science Group Preprints Eshof, Frommer, Lippert, Schilling, van der Vorst; Numerical Methods for the QCD Overlap Operator: I. Sign-Function and Error Bounds; Computer Physics Communications, Volume 146, Issue2, 2002