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arXiv · 1805.11486

On weak Sierpi\'nski sets in groups and free subgroups

Agnieszka Bier·Piotr Słanina
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Abstract

In this paper we discuss the problem of existence of so called weak Sierpi\'nski sets in groups. It is known that group $G$ has a Sierpi\'nski subset if and only if it contains a free subgroup. In their paper, Tomkowicz and Wagon conjectured that an analogous result holds also for the weaker condition. We derive a number of properties of groups with weak Sierpi\'nski subsets and use them to prove the above mentioned conjecture. This is an improved version of arXiv:1805.11486. Some of the included proofs have been simplified and shortened.

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Agnieszka Bier, Piotr Słanina. 2018-05-29. On weak Sierpi\'nski sets in groups and free subgroups. https://arxiv.org/abs/1805.11486

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