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arXiv 1004.2639math.CO
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关于Tutte多项式的几个不等式

Some inequalities for the Tutte polynomial

L. E. Chavez-Lomelí, C. Merino, S. D. Noble, M. Ramírez-Ibañez

摘要:

本文证明了无环铺砌拟阵的Tutte多项式沿线段x+y=p的正象限部分是凸的。每一个无圈铺砌拟阵都属于含有两个不相交基或基集是M* 的两个基的并的拟阵类。对于后一类,我们给出了一个证明:对于a >= 2,T_M(a,a)<= max {T_M(2a,0),T_M(0,2a)}。我们猜想对于同一类拟阵,T_M(1,1)<= max {T_M(2,0),T_M(0,2)}.我们也证明了这个猜想的一些家庭的图和拟阵。

英文摘要:

We prove that the Tutte polynomial of a coloopless paving matroid is convex along the portions of the line segments x+y=p lying in the positive quadrant. Every coloopless paving matroids is in the class of matroids which contain two disjoint bases or whose ground set is the union of two bases of M*. For this latter class we give a proof that T_M(a,a) <= max {T_M(2a,0), T_M(0,2a)} for a >= 2. We conjecture that T_M(1,1) <= max {T_M(2,0), T_M(0,2)} for the same class of matroids. We also prove this conjecture for some families of graphs and matroids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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