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Chandrasekaran, S. (author), Dewilde, P. (author), Gu, M. (author), Somasunderam, N. (author)It is shown that the numerical rank of the off-diagonal blocks of certain Schur complements of matrices that arise from the finite-difference discretization of constant coefficient, elliptic PDEs in two spatial dimensions is bounded by a constant independent of the grid size. Moreover, in three-dimensional problems the Schur complements are...journal article 2010
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