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arXiv 1004.4669math.GT
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计算Heegaard分裂的合痕类

Calculating isotopy classes of Heegaard splittings

Jesse Johnson

摘要:

我们表明,给定一个部分平坦的角理想三角剖分的3-流形$M$的边界(定义由Lackenby),有一个算法来产生一个列表的Heegaard分裂$M$,使下面一个给定的属$g$,每个合痕类出现一次。特别是,该算法精确地确定了两个几乎正常的表面表示Heegaard分裂是同位素在周围的3-流形。一个密切相关的算法确定的最小亏格共同稳定的任何两个Heegaard分裂的名单上。事实上,该方法的特点,在任何三角形的Heegaard表面之间的同位素,但存在无限多个正常的表面相同的属防止这种特性的算法一般。

英文摘要:

We show that given a partially flat angled ideal triangulation for a 3-manifold $M$ with boundary (as defined by Lackenby), there is an algorithm to produce a list of Heegaard splittings for $M$ such that below a given genus $g$, each isotopy class appears exactly once. In particular, this algorithm determines precisely when two almost normal surfaces represent Heegaard splittings that are isotopic in the ambient 3-manifold. A closely related algorithm determines the smallest genus common stabilization of any two Heegaard splittings on the list. The methods, in fact, characterize isotopies between Heegaard surfaces in any triangulation, but the existence of infinitely many normal surfaces of the same genus prevents this characterization from being algorithmic in general.

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