V. Metaftsis

collaborators

3 papers

math.GR2025

The intersection of the subgroups of finite $p$ -index in a multiple HNN-extension of an infinite cyclic group

V. Metaftsis, D. Tsipa

Let $G$ be a multiple HNN-extension of an infinite cyclic group. We will calculate the intersection $(N_{p})_{I ¨} (G)$ of the normal subgroups of finite $p$ -index in $G$ thus genera…

math.AG2025

Pairs of tree dessins, their Shabat polynomials, and monodromy groups

Benjamin Dupont, Revekka Kyriakoglou, Vassilis Metaftsis +2

Coverings of the Riemann sphere by itself, ramified over two points, are given by so-called Shabat polynomials. The correspondence between Grothendieck's dessins d'enfants and Bely…

math.GR2025

The intersections of the lower central series and the subgroups of finite p-index of Generalized Baumslag-Solitar tree groups

V. Metaftsis, D. Tsipa

For a Generalized Baumslag-Solitar group $G$ with underling graph a tree, we calculate the intersection $I^_{I ¨}^{3} (G)$ of the lower central series and the intersection $(N_{p})_{I ¨} (G)$ …

The intersection of the subgroups of finite p-index in a multiple HNN-extension of an infinite cyclic group

Pairs of tree dessins, their Shabat polynomials, and monodromy groups

The intersections of the lower central series and the subgroups of finite p-index of Generalized Baumslag-Solitar tree groups

The intersection of the subgroups of finite $p$ -index in a multiple HNN-extension of an infinite cyclic group