We study notions of persistent homotopy groups of compact metric spaces together with their stability properties in the Gromov-Hausdorff sense. We pay particular attention to the case of fundamental groups, for which we obtain a more precise description. Under fairly mild assumptions on the spaces, we proved that the classical fundamental group has an underlying tree-like structure (i.e. a dendrogram) and an associated ultra-metric.
翻译:我们从格罗莫夫-豪斯多夫的角度研究顽固的单质紧凑度空间组及其稳定性,我们特别关注基本组群的情况,我们对此有更精确的描述。 在相对温和的空间假设下,我们证明古典基本组群具有树状结构(即斜体)和相关的超度度测量。