Abstract
Mixed polynomial matrices are polynomial matrices with two kinds of nonzero coefficients: fixed constants that account for conservation laws and independent parameters that represent physical characteristics. The computation of their maximum degrees of minors is known to be reducible to valuated independent assignment problems, which can be solved by polynomial numbers of additions, subtractions, and multiplications of rational functions. However, these arithmetic operations on rational functions are much more expensive than those on constants.
In this paper, we present a new algorithm of combinatorial relaxation type. The algorithm finds a combinatorial estimate of the maximum degree by solving a weighted bipartite matching problem, and checks if the estimate is equal to the true value by solving independent matching problems. The algorithm mainly relies on fast combinatorial algorithms and performs numerical computation only when necessary. In addition, it requires no arithmetic operations on rational functions. As a byproduct, this method yields a new algorithm for solving a linear valuated independent assignment problem.


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Acknowledgements
The authors are grateful to Kazuo Murota for helpful comments on the manuscript. We would also like to thank the anonymous referee for insightful suggestions. This work is supported by a Grant-in-Aid for Scientific Research from the Japan Society for Promotion of Science.
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A preliminary version of this paper has appeared in Proceedings of the 15th Conference on Integer Programming and Combinatorial Optimization, LNCS 6655, Springer, 2011, pp. 274–286.
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Iwata, S., Takamatsu, M. Computing the Maximum Degree of Minors in Mixed Polynomial Matrices via Combinatorial Relaxation. Algorithmica 66, 346–368 (2013). https://doi.org/10.1007/s00453-012-9640-8
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DOI: https://doi.org/10.1007/s00453-012-9640-8