V. Metaftsis

collaborators

4 papers

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 $γ_{ω} (G)$ of the lower central series and the intersection $(N_{p})_{ω} (G)$ of…

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 $(N_{p})_{ω} (G)$ of the normal subgroups of finite $p$ -index in $G$ thus general…

math.GR2005

On the residual finiteness of outer automorphisms of relatively hyperbolic groups

V. Metaftsis, M. Sykiotis

We show that every virtually torsion-free subgroup of the outer automorphism group of a conjugacy separable hyperbolic group is residually finite. As a result, we are able to prove…

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

On the residual finiteness of outer automorphisms of relatively hyperbolic groups

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