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arXiv 0707.2297math.CO
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Tutte多项式的边着色模型及相关的图不变量

Edge colouring models for the Tutte polynomial and related graph invariants

Andrew J. Goodall

摘要:

对于整数q>1,我们导出了(i)双曲线H_q上的图G的Tutte多项式,(ii)G的群值q-流集合的对称权计数器,以及(iii)包含这些多项式和Stanley对称单色多项式的主特化阶q的更一般的顶点着色模型分拆函数的边q-着色模型.本文的后半部分给出了一类定义在k-正则图上的非对称边q-染色模型,当q >= k时,其分拆函数分别计算G的正常边k-染色的个数.

英文摘要:

For integer q>1, we derive edge q-colouring models for (i) the Tutte polynomial of a graph G on the hyperbola H_q, (ii) the symmetric weight enumerator of the set of group-valued q-flows of G, and (iii) a more general vertex colouring model partition function that includes these polynomials and the principal specialization order q of Stanley's symmetric monochrome polynomial. In the second half of the paper we exhibit a family of non-symmetric edge q-colouring models defined on k-regular graphs, whose partition functions for q >= k each evaluate the number of proper edge k-colourings of G when G is Pfaffian.

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