The present paper focuses on the study of fundamental group of Minkowski space with the fine topology which has been found to contain uncountably many subgroups isomorphic to the additive group of integers.

中文翻译：

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闵可夫斯基空间上的基本群和精细拓扑

本文重点研究具有精细拓扑的闵可夫斯基空间的基本群，该空间包含无数个与整数加法群同构的子群。