Shifting algorithms for tree partitioning with general weighting functions |
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Authors: | Ronald I Becker Yehoshua Perl |
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Institution: | 1. Department of Mathematics, University of Cape Town, 7700 Rondebosch, South Africa;2. Department of Mathematics, University of Tennessee, Knoxville, Tennessee 37996 USA |
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Abstract: | Recently two shifting algorithms were designed for two optimum tree partitioning problems: The problem of max-min q-partition 4] and the problem of min-max q-partition 1]. In this work we investigate the applicability of these two algorithms to max-min and min-max partitioning of a tree for various different weighting functions. We define the families of basic and invariant weighting functions. It is shown that the first shifting algorithm yields a max-min q-partition for every basic weighting function. The second shifting algorithm yields a min-max q-partition for every invariant weighting function. In addition a modification of the second algorithm yields a min-max q-partition for the noninvariant diameter weighting function. |
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