4 papers
A note on the reflexibility of regular maps with automorphism group PGL(2,q)
Darius W. Young
By a short adaptation of an argument of Singerman, we show that for every prime power , every orientably regular map (or hypermap) whose orientation-preserving automorphism grou…
Density of quotient orders in groups and applications to locally-transitive graphs
Marston Conder, Gabriel Verret, Darius Young
We prove that the set of orders of finite quotients of a finitely generated group has natural density 0, 1/2 or 1, and characterise when each of these cases occurs. We apply this t…
Quotient order density of ordinary triangle groups
Darius Young
In this paper, we show that the natural density (among the positive integers) of the set of orders of the finite quotients of any ordinary triangle group is zero. This is achieved…
Soluble quotients of triangle groups
Marston D. E. Conder, Darius W. Young
This paper helps explain the prevalence of soluble groups among the automorphism groups of regular maps (at least for `small' genus), by showing that every non-perfect hyperbolic o…