On the subgroups and normal subgroups of the group representation of the Cayley tree

Abstract

In this paper, we give a characterization of the normal subgroups of index $2^s(2n+1),s\in \{1,2\},n\in \mathbb{N}$ and of the subgroups of index three of the group representation of the Cayley tree.

arXiv commentarXiv admin note: text overlap with arXiv:1504.01485; text overlap with arXiv:0904.1850 by other authors