New results on the prefix membership problem for one-relator groups
New results on the prefix membership problem for one-relator groups
复制标题
关于单相关组的前缀成员资格问题的新结果
DOI:
10.1090/tran/8338
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发表时间:
2021
影响因子:
1.3
通讯作者:
Dolinka I
中科院分区:
文献类型:
--
作者:
Dolinka I
In this paper we prove several results regarding decidability of the membership problem for certain submonoids in amalgamated free products and HNN extensions of groups. These general results are then applied to solve the prefix membership problem for a number of classes of one-relator groups which are low in the Magnus–Moldavanskiĭ hierarchy. Since the prefix membership problem for one-relator groups is intimately related to the word problem for one-relator special inverse monoids in the-unitary case (as discovered in 2001 by Ivanov, Margolis and Meakin), these results yield solutions of the word problem for several new classes of one-relator special inverse monoids. In establishing these results, we introduce a new theory of conservative factorisations of words which provides a link between the prefix membership problem of a one-relator group and the group of units of the corresponding one-relator special inverse monoid. Finally, we exhibit the first example of a one-relator group, defined by a reduced relator word, that has an undecidable prefix membership problem. References
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