On the number of generators of groups acting arc-transitively on graphs

M Barbieri, P Spiga - arxiv preprint arxiv:2405.13603, 2024 - arxiv.org
Given a finite connected graph ${\Gamma} $ and a group $ G $ acting transitively on the
vertices of ${\Gamma} $, we prove that the number of vertices of ${\Gamma} $ and the …

Stabilizers of consistent walks

M Lekše - Discrete Mathematics, 2025 - Elsevier
A walk of length n in a graph is consistent if there exists an automorphism of the graph that
maps the initial n vertices to the final n vertices of the walk, preserving their order. In this …

An application of the Local C(G,T) Theorem to a conjecture of Weiss

P Spiga - Bulletin of the London Mathematical Society, 2016 - academic.oup.com
Let be a connected-vertex-transitive graph, let be a vertex of and let be the permutation
group induced by the action of the vertex-stabilizer on the neighbourhood. The graph is said …

[HTML][HTML] A theory of semiprimitive groups

M Giudici, L Morgan - Journal of Algebra, 2018 - Elsevier
A transitive permutation group is semiprimitive if each of its normal subgroups is transitive or
semiregular. Interest in this class of groups is motivated by two sources: problems arising in …

Density of quotient orders in groups and applications to locally-transitive graphs

M Conder, G Verret, D Young - arxiv preprint arxiv:2410.17828, 2024 - arxiv.org
arxiv:2410.17828v1 [math.GR] 23 Oct 2024 Page 1 arxiv:2410.17828v1 [math.GR] 23 Oct
2024 DENSITY OF QUOTIENT ORDERS IN GROUPS AND APPLICATIONS TO LOCALLY-TRANSITIVE …

Two local conditions on the vertex stabiliser of arc-transitive graphs and their effect on the Sylow subgroups

P Spiga - Journal of Group Theory, 2012 - degruyter.com
In this paper we study G-arc-transitive graphs Δ where the permutation group induced by the
stabiliser Gx of the vertex x on the neighbourhood Δ (x) satisfies the two conditions given in …

Lifting a prescribed group of automorphisms of graphs

P Potočnik, P Spiga - Proceedings of the American Mathematical Society, 2019 - ams.org
In this paper we are interested in lifting a prescribed group of automorphisms of a finite
graph via regular covering projections. Let $\Gamma $ be a finite graph and let $\mathrm …

Groups acting on trees with prescribed local action

S Tornier - Journal of the Australian Mathematical Society, 2023 - cambridge.org
We extend the Burger–Mozes theory of closed, nondiscrete, locally quasiprimitive
automorphism groups of locally finite, connected graphs to the semiprimitive case, and …

The distinguishing number of quasiprimitive and semiprimitive groups

A Devillers, L Morgan, S Harper - Archiv der Mathematik, 2019 - Springer
The distinguishing number of G\leqslant Sym (Ω) G⩽ Sym (Ω) is the smallest size of a
partition of Ω Ω such that only the identity of G fixes all the parts of the partition. Extending …

Bounding the covolume of lattices in products

PE Caprace, A Le Boudec - Compositio Mathematica, 2019 - cambridge.org
Bounding the covolume of lattices in products Page 1 Bounding the covolume of lattices in
products Pierre-Emmanuel Caprace and Adrien Le Boudec Compositio Math. 155 (2019) …