74 citations · 255 across the 21 of their papers we have counts for
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astro-ph.IM2013★ 12 cited
Sharp parameter bounds for certain maximal point lenses
Robert Luce, Olivier Sète, Jörg Liesen
Starting from an -point circular gravitational lens having images, Rhie (2003) used a perturbation argument to construct an -point lens producing images. In t…
math.NA2013★ 1 cited
Max-min and min-max approximation problems for normal matrices revisited
Jörg Liesen, Petr Tichý
We give a new proof for an equality of certain max-min and min-max approximation problems involving normal matrices. The previously published proofs of this equality apply tools fr…
math.NA2013★ 1 cited
Characterization of worst-case GMRES
Vance Faber, Jörg Liesen, Petr Tichý
Given a matrix and iteration step , we study a best possible attainable upper bound on the GMRES residual norm that does not depend on the initial vector . This quantity…