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Lower bounds for the partitioning of graphs

Published: 01 September 1973 Publication History

Abstract

Let a k-partition of a graph be a division of the vertices into k disjoint subsets containing m1m2,..., ≥mk vertices. Let Ec be the number of edges whose two vertices belong to different subsets. Let λ1 ≥ λ2, ..., ≥ λk, be the k largest eigenvalues of a matrix, which is the sum of the adjacency matrix of the graph plus any diagonal matrix U such that the suomf all the elements of the sum matrix is zero. Then Ec ≥ 1/2Σr=1k-mrλr.
A theorem is given that shows the effect of the maximum degree of any node being limited, and it is also shown that the right-hand side is a concave function of U.C omputational studies are madoef the ratio of upper bound to lower bound for the two-partition of a number of random graphs having up to 100 nodes.

References

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R. L. Russo, P. H. Oden and P. K. Wolff, Sr., "A Heuristic Procedure for the Partitioning and Mapping of Computer Logic Blocks to Modules," to be published in the IEEE Trans. Computers.
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H. R. Charney and D. L. Plato, "Efficient Partitioning of Components," Share/ACM/IEEE Design Automation Workshop, Washington, D. C., July, 1968.
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L. W. Comeau, "A Study of User Program Optimization in a Paging System," ACM Symposium on Operating System Principles, Gatlinburg, Tennessee, October, 1967.
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P. J. Denning, "Virtual Memory," Computing Surveys 2, 153 (September 1970).
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C. T. Zahn, "Graph Theoretical Methods for Detecting and Describing Gestalt Clusters," IEEE Trans. Computers C-20, 68 (1971).
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K. M. Hall, "r-Dimension Quadratic Placement Algorithm," Management Science 17, 219 (1971).
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A. J. Hoffman and H. W. Wielandt, "The Variation of the Spectrum of a Normal Matrix," Duke Math. J. 20, 37 (1953).
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M. Marcus and H. Minc, A Survey of Matrix Theory and Matrix Inequalities, Allyn and Bacon, Inc., Boston, 1964 p. 120, Chapter II. 4.4.14.
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K. Fan, "On a Theorem of Weyl Concerning Eigenvalues of Linear Transformations, I," Proc. National Academy Science USA 35, 652 (1949).

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Published In

cover image IBM Journal of Research and Development
IBM Journal of Research and Development  Volume 17, Issue 5
September 1973
85 pages

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IBM Corp.

United States

Publication History

Published: 01 September 1973
Received: 20 March 1973

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