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Let $\text{Homeo}_{+}(\mathbb{S}^1)$ denote the group of orientationpreserving homeomorphisms of the circle $\mathbb{S}^1$. A subgroup $G$ of$\text{Homeo}_{+}(\mathbb{S}^1)$ is tightly transitive if it is topologicallytransitive and no subgroup $H$ of $G$ with $[G: H]=\infty$ has this property;is almost minimal if it has at most countably many nontransitive points. In thepaper, we determine all the topological conjugation classes of tightlytransitive and almost minimal subgroups of $\text{Homeo}_{+}(\mathbb{S}^1)$which are isomorphic to $\mathbb{Z}^n$ for any integer $n\geq 2$.

Topological conjugation classes of tightly transitive subgroups of $\text{Homeo}_{+}(\mathbb{S}^1)$