Affiliation:
1. Tel Aviv University, Tel Aviv, Israel
2. University of Haifa, Haifa, Israel
Abstract
The generalized nested dissection method, developed by Lipton et al. [1979], is a seminal method for solving a linear system
Ax
=
b
where
A
is a symmetric positive definite matrix. The method runs extremely fast whenever
A
is a well-separable matrix (such as matrices whose underlying support is planar or avoids a fixed minor). In this work, we extend the nested dissection method to apply to
any
nonsingular well-separable matrix over
any
field. The running times we obtain essentially match those of the nested dissection method. An important tool is a novel method for matrix sparsification that preserves determinants and minors, and that guarantees that constant powers of the sparsified matrix remain sparse.
Funder
European Research Council
Hermann Minkowski Minerva Center for Geometry at Tel Aviv University
Publisher
Association for Computing Machinery (ACM)
Subject
Artificial Intelligence,Hardware and Architecture,Information Systems,Control and Systems Engineering,Software
Cited by
9 articles.
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