Abstract
We consider graphs on two-dimensional space forms which are quotient graphs Γ/F, where Γ is an infinite, 3-connected, face, vertex, or edge transitive planar graph andF is a subgroup of Aut(Γ), all of whose elements act freely on Γ. The enumeration of quotient graphs with transitivity properties reduces to computing the normalizers in Aut(Γ) of the subgroupsF. Results include: all isogonal toriodal polyhedra belong to the two families found by Grunbaum and Shephard; there are no transitive graphs on the Mobius band; there is a graph on the Klein bottle whose automorphism group acts transitively on its faces, edges, and vertices.
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