C
Chen Greif
Researcher at University of British Columbia
Publications - 72
Citations - 1951
Chen Greif is an academic researcher from University of British Columbia. The author has contributed to research in topics: Linear system & Matrix (mathematics). The author has an hindex of 22, co-authored 67 publications receiving 1695 citations. Previous affiliations of Chen Greif include Tel Aviv University & PTC.
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ℓ1-Sparse reconstruction of sharp point set surfaces
TL;DR: An ℓ1-sparse method for the reconstruction of a piecewise smooth point set surface that consists mainly of smooth modes, with the residual of the objective function strongly concentrated near sharp features.
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On solving block-structured indefinite linear systems
Gene H. Golub,Chen Greif +1 more
TL;DR: An augmented Lagrangian approach is focused on: a technique that modifies the (1,1) block without changing the system size, which makes the system easier to solve.
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A mixed finite element method with exactly divergence-free velocities for incompressible magnetohydrodynamics
TL;DR: A mixed finite element method for the numerical discretization of a stationary incompressible magnetohydrodynamics problem, in two and three dimensions, produces exactly divergence-free velocity approximations, and captures the strongest magnetic singularities.
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An Arnoldi-type algorithm for computing page rank
Gene H. Golub,Chen Greif +1 more
TL;DR: A variant of the restarted refined Arnoldi method is proposed, which does not involve Ritz value computations, and hence techniques based on matrix-vector products must be applied.
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Preconditioners for the discretized time‐harmonic Maxwell equations in mixed form
Chen Greif,Dominik Schötzau +1 more
TL;DR: A new preconditioning technique for iteratively solving linear systems arising from flnite element discretization of the mixed formulation of the time-harmonic Maxwell equations is introduced, motivated by spectral equivalence properties of the discrete operators, but are augmentation-free and Schur complement-free.