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arXiv 1902.00840math.GNmath.FAmath.GR
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无限秩自由群上的SSGP拓扑

SSGP topologies on free groups of infinite rank

Dmitri Shakhmatov, Víctor Hugo Yañez

摘要:

证明了每个具有无穷多个生成元的自由群G都有一个Hausdorff群拓扑T,T具有如下性质:对G的单位元的每个T-开邻域U,G中的每个元素g都可以表示为乘积g= g_1g_2. g_k,使得由每个g_i生成的循环群包含在U中.特别地,G允许一个Hausdorff群拓扑具有Gould的小子群生成性质。这提供了一个积极的答案,舒适和古尔德的问题的情况下,自由群无限多个发电机。具有多个生成元的自由群的情况仍然是开放的。

英文摘要:

We prove that every free group G with infinitely many generators admits a Hausdorff group topology T with the following property: for every T-open neighbourhood U of the identity of G, each element g in G can be represented as a product g=g_1 g_2 ... g_k such that the cyclic group generated by each g_i is contained in U. In particular, G admits a Hausdorff group topology with the small subgroup generating property of Gould. This provides a positive answer to a question of Comfort and Gould in the case of free groups with infinitely many generators. The case of free groups with finitely many generators remains open.

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