On the half-plane property and the Tutte group of a matroid
| Autor: | Rafael S. González D'León, Petter Brändén |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Polynomial
Mathematics::Combinatorics Plane (geometry) Group (mathematics) Existential quantification 68R05 05B35 Stable polynomial Matroid Half-plane property Theoretical Computer Science Combinatorics Set (abstract data type) Computational Theory and Mathematics Computer Science::Discrete Mathematics Tutte group FOS: Mathematics Mathematics - Combinatorics Discrete Mathematics and Combinatorics Combinatorics (math.CO) Mathematics Projective geometry |
| Zdroj: | Journal of Combinatorial Theory, Series B. 100:485-492 |
| ISSN: | 0095-8956 |
| DOI: | 10.1016/j.jctb.2010.04.001 |
| Popis: | A multivariate polynomial is stable if it is non-vanishing whenever all variables have positive imaginary parts. A matroid has the weak half-plane property (WHPP) if there exists a stable polynomial with support equal to the set of bases of the matroid. If the polynomial can be chosen with all of its nonzero coefficients equal to one then the matroid has the half-plane property (HPP). We describe a systematic method that allows us to reduce the WHPP to the HPP for large families of matroids. This method makes use of the Tutte group of a matroid. We prove that no projective geometry has the WHPP and that a binary matroid has the WHPP if and only if it is regular. We also prove that T_8 and R_9 fail to have the WHPP. 8 pages. To appear in J. Combin. Theory Ser. B |
| Databáze: | OpenAIRE |
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