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arXiv 0901.2288math.GT
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复杂性、Heegaard图和广义Dunwoody流形

Complexity, Heegaard diagrams and generalized Dunwoody manifolds

Alessia Cattabriga, Michele Mulazzani, Andrei Vesnin

摘要:

我们处理的Matveev复杂性的紧定向3-流形表示通过Heegaard图。这导致我们的定义修改Heegaard复杂性的Heegaard图和流形。我们定义了一类流形,它是Dunwoody流形的推广,包括两桥结和链接的循环分支覆盖,环面结,一些椒盐卷饼结,和一些θ-图。利用修正的Heegaard复杂度,我们得到了它们的Matveev复杂度的上界,该上界线性依赖于覆盖的阶.此外,由于Matveev和Pervova的同调参数,我们得到的下界。

英文摘要:

We deal with Matveev complexity of compact orientable 3-manifolds represented via Heegaard diagrams. This lead us to the definition of modified Heegaard complexity of Heegaard diagrams and of manifolds. We define a class of manifolds which are generalizations of Dunwoody manifolds, including cyclic branched coverings of two-bridge knots and links, torus knots, some pretzel knots, and some theta-graphs. Using modified Heegaard complexity, we obtain upper bounds for their Matveev complexity, which linearly depend on the order of the covering. Moreover, using homology arguments due to Matveev and Pervova we obtain lower bounds.

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