首页> 外文会议>International Conference on Algebraic Biology(AB 2007); 20070702-04; Castle of Hagenberg(AT) >Toric Ideals of Phylogenetic Invariants for the General Group-Based Model on Claw Trees K_(1,n)
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Toric Ideals of Phylogenetic Invariants for the General Group-Based Model on Claw Trees K_(1,n)

机译:爪树K_(1,n)上基于一般组的模型的系统发生不变性的复曲面理想

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We address the problem of studying the toric ideals of phylogenetic invariants for a general group-based model on an arbitrary claw tree. We focus on the group Z_2 and choose a natural recursive approach that extends to other groups. The study of the lattice associated with each phylogenetic ideal produces a list of circuits that generate the corresponding lattice basis ideal. In addition, we describe explicitly a quadratic lexicographic Grobner basis of the toric ideal of invariants for the claw tree on an arbitrary number of leaves. Combined with a result of Sturm-fels and Sullivant, this implies that the phylogenetic ideal of every tree for the group Z_2 has a quadratic Grobner basis. Hence, the coordinate ring of the toric variety is a Koszul algebra.
机译:我们解决了在任意爪树上研究基于群体的一般模型的系统发生不变量的复曲面理想的问题。我们专注于Z_2组,并选择一种自然递归方法扩展到其他组。对与每个系统发育理想相关的晶格的研究产生了一系列电路,这些电路生成了相应的晶格基础理想。此外,我们明确描述了任意数量的叶子上的爪树不变式复曲面理想的二次字典序Grobner基础。结合Sturm-fels和Sullivant的结果,这意味着Z_2组的每棵树的系统发育理想具有二次Grobner基础。因此,复曲面变体的座标环是Koszul代数。

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