Browsing Morris, Joy by Title

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  • Morris, Joy; Spiga, Pablo; Verret, Gabriel (Electronic Journal of CombinatoricsArts and ScienceDepartment of Mathematics and Computer ScienceUniversity of LethbridgeUniversity of Milano-BicoccaThe University of Western Australia, 2015)
    We characterise connected cubic graphs admitting a vertex-transitive group of automorphisms with an abelian normal subgroup that is not semiregular. We illustrate the utility of this result by using it to prove that the ...
  • Morris, Joy; Praeger, Cheryl E.; Spiga, Pablo (Drustvo Matematikov, Fizikov in AstronomovArts and ScienceDepartment of Mathematics and Computer ScienceUniversity of LethbridgeUniversity of Western AustraliaUniversity of Padova, 2009)
    In this paper, we examine the structure of vertex- and edge-transitive strongly regular graphs,using normal quotient reduction. We show that their reducible graphs in this family have quasi primitive automorphism groups, ...
  • Dobson, Edward; Morris, Joy (Electronic Journal of CombinatoricsArts and ScienceDepartment of Mathematics and Computer ScienceMississippi State UniversityUniversity of Lethbridge, 2002)
    Let S be a subset of the units in Zn. Let Γ be a circulant graph of order n (a Cayley graph of Zn) such that if ij ∈ E(Γ), then i − j (mod n) ∈ S. Toida conjectured that if Γ0 is another circulant graph of order n, then Γ ...
  • Dobson, Ted; Hujdurovic, Ademir; Kutnar, Klavdija; Morris, Joy (The University of Queensland, Centre for Discrete Mathematics and ComputingArts and ScienceDepartment of Mathematics and Computer ScienceMississippi State UniversityUniversity of PrimoskaUniversity of Lethbridge, 2017)
    In a Cayley digraph on a group G, if a distinct colour is assigned to each arc-orbit under the left-regular action of G, it is not hard to show that the elements of the left-regular action of G are the only digraph ...