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Subgraph sparsification and nearly optimal ultrasparsifiers

Published: 05 June 2010 Publication History

Abstract

We consider a variation of the spectral sparsification problem where we are required to keep a subgraph of the original graph. Formally, given a union of two weighted graphs G and W and an integer k, we are asked to find a k-edge weighted graph Wk such that G+Wk is a good spectral sparsifer of G+W. We will refer to this problem as the subgraph (spectral) sparsification. We present a nontrivial condition on G and W such that a good sparsifier exists and give a polynomial-time algorithm to find the sparsifer.
As an application of our technique, we show that for each positive integer k, every n-vertex weighted graph has an (n-1+k)-edge spectral sparsifier with relative condition number at most n/k log n, ~O(log log n) where ~O() hides lower order terms.
Our bound nearly settles a question left open by Spielman and Teng about ultrasparsifiers.
We also present another application of our technique to spectral optimization in which the goal is to maximize the algebraic connectivity of a graph (e.g. turn it into an expander) with a limited number of edges.

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cover image ACM Conferences
STOC '10: Proceedings of the forty-second ACM symposium on Theory of computing
June 2010
812 pages
ISBN:9781450300506
DOI:10.1145/1806689
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 05 June 2010

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Author Tags

  1. algebraic connectivity
  2. approximation algorithms
  3. graph sparsification
  4. ultrasparsifiers

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STOC'10: Symposium on Theory of Computing
June 5 - 8, 2010
Massachusetts, Cambridge, USA

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