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arXiv 1809.09362math.CO
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自由线排列与单纯线排列的组合学

Combinatorics of free and simplicial line arrangements

David Geis

摘要:

研究实射影平面上伪线排列的组合学。我们的重点在于两类安排:单纯安排和安排的特征多项式只有实根。我们得到的不等式涉及的$t$ -向量的安排考虑。作为应用,我们得到了一些有限性和分类结果。此外,我们还证明了特征多项式在$\mathbb{R}$上分裂的实伪线排列的Dirac Motzkin猜想.

英文摘要:

We study the combinatorics of pseudoline arrangements in the real projective plane. Our focus lies on two classes of arrangements: simplicial arrangements and arrangements whose characteristic polynomials have only real roots. We derive inequalities involving the $t$-vectors of the arrangements in consideration. As application, we obtain some finiteness and classification results. Moreover, we are able to prove the Dirac Motzkin Conjecture for real pseudoline arrangements whose charateristic polynomials split over $\mathbb{R}$.

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