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arXiv 1302.5451math.GR
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对非正式呈现的群体的强大可访问性

Strong accessibility for finitely presented groups

Larsen Louder, Nicholas Touikan

摘要:

群的层次是通过迭代地将群分解的图传递到顶点群而获得的群的有根树。我们定义了一个(几乎)边群的(相对)细长JSJ族,并证明了它是有限的,只要这个群不包含任何具有无穷二面角的细长子群,并且满足棱道群的子群链上的升链条件.作为推论,SL(n,Z)的(虚)不含$2$ --挠群的细长JSJ族和SL(n,Z)的弱表现子群都是有限的.

英文摘要:

A hierarchy of a group is a rooted tree of groups obtained by iteratively passing to vertex groups of graphs of groups decompositions. We define a (relative) slender JSJ hierarchy for (almost) finitely presented groups and show that it is finite, provided the group in question doesn't contain any slender subgroups with infinite dihedral quotients and satisfies an ascending chain condition on certain chains of subgroups of edge groups. As a corollary, slender JSJ hierarchies of hyperbolic groups which are (virtually) without $2$--torsion and finitely presented subgroups of SL(n,Z) are both finite.

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