On Riemann Surfaces of genus g with 4g automorphisms

E. Bujalance, A. F. Costa, M. Izquierdo

We determine, for all genus $g\ge 2$ the Riemann surfaces of genus $g$ with $4g$ automorphisms. For $g\ne$ $3,6,12,15$ or $30$, this surfaces form a real Riemann surface $\mathcal…