Department of
Math & CS

Joy Morris

BSc., Trent University
PhD, Simon Fraser University
Associate Professor
 

Address: Joy Morris
Department of Mathematics & Computer Science
University of Lethbridge
4401 University Drive
Lethbridge, AB
CANADA     T1K 3M4
           
Phone: (403) 332-4100
Fax: (403) 317-2882
Office: C536
E-mail: joy@cs.uleth.ca

Teaching Activities     

Spring 2014 - Summer 2014
(no teaching duties)

Research Activities     

My research interests are in Combinatorics, in particular Algebraic Graph Theory (Cayley Graphs). I have published several papers. These include the papers available for download below in .pdf format. Many of the papers below represent joint work, as indicated in the authorship.
Connectivity of Cayley Graphs: A Special Family (Appeared in JCMCC, 1996)
Isomorphic Cayley Graphs on different Groups (Appeared in Congressus Numerantium, 1996)
Automorphism groups with Cyclic Commutator Subgroups and Hamilton Cycles (With E. Dobson, H. Gavlas and D. Witte. Appeared in Discrete Math., 1998)
Self-complementary Circulant Graphs (With B. Alspach and V. Vilfred. Appeared in Ars Combinatoria, 1999)
Isomorphic Cayley Graphs on Nonisomorphic Groups (Appeared in JGT, 1999)
Classifying Arc-Transitive Circulants of Squarefree Order (With C. H. Li and D. Marusic. Appeared in JACO, 2001)
Toida's Conjecture is True (With E. Dobson. Appeared in Electronic J. of Combin., 2002)
Results towards showing Z_p^n is a CI-group (Appeared in Congressus Numerantium, 2002)
Stitching Images Back Together (With F. Lutscher, J. McNulty, and K. Seyffarth. Appeared in Congressus Numerantium, 2003)
Flows that are sums of hamiltonian cycles in Cayley graphs on abelian groups (With D. Morris and D. Moulton. Appeared in Discrete Math., 2005)
On automorphism groups of circulant digraphs of square-free order (With E. Dobson. Appeared in Discrete Math., 2005)
Normal circulant graphs with noncyclic regular subgroups (With D. Marusic. Appeared in JGT, 2005)
Brian Alspach and his work (With M. Sajna. Appeared in Discrete Math., 2005)
Automorphism groups of circulant graphs - a survey (Appeared in Graph Theory, Trends in Math., Birkhauser, 2006)
Cyclic hamiltonian cycle systems of the complete graph minus a 1-factor (With H. Jordon. Appeared in Discrete Math., 2008)
Automorphism groups of wreath product digraphs (With E. Dobson. Appeared in Electronic J. of Combin., 2009)
Directed cyclic hamiltonian cycle systems of the complete symmetric digraph (With H. Jordon. Appeared in Discrete Math., 2009)
Hamiltonian cycles in (2,3,c)-circulant digraphs (With D. Morris and K. Webb. Appeared in Discrete Math., 2009)
Strongly regular edge-transitive graphs (With C. Praeger and P. Spiga. Appeared in Ars Mathematica Contemporanea, 2009)
Balanced Cayley graphs and balanced planar graphs (With P. Spiga and K. Webb. Appeared in Discrete Math., 2010)
Hamiltonian cycles in Cayley graphs whose order has few prime factors (With K. Kutnar, D. Marusic, D. Morris and P. Sparl. Appeared in Ars Mathematica Contemporanea, 2012.)
Cayley graphs of order 16p are hamiltonian (With S. Curran and D. Morris. Appeared in Ars Mathematica Contemporanea, 2012.)
Generalised quadrangles with a group of automorphisms acting primitively on points and lines (With J. Bamberg, M. Giudici, G. Royle and P. Spiga. Appeared in J. Combin. Theory - A, 2012.)
Asymptotic automorphism groups of circulant graphs and digraphs (With S. Bhoumik and E. Dobson. Accepted by Ars Math. Comtemp.)
On the maximum orders of elements of finite almost simple groups and primitive permutation groups, (With S. Guest, C. Praeger, and P. Spiga. Accepted by Trans. Amer. Math. Soc.)
Quotients of CI-groups are CI-groups, (With E. Dobson. Accepted by Graphs and Combin.)
2-distance-transitive digraphs preserving a cartesian decomposition (With P. Spiga. Submitted to J. Alg.)
Automorphisms of circulants that respect partitions, (Submitted to Contributions to Discrete Math.)
Affine transformations of finite vector spaces with large orders or few cycles, (With S. Guest, C. Praeger, and P. Spiga. Submitted to J. London Math. Soc.)
Finite primitive permutation groups containing a permutation having at most four cycles, (With S. Guest, C. Praeger, and P. Spiga. Submitted to J. London Math. Soc.)
Automorphisms of Cayley graphs on generalised dicyclic groups, (With P. Spiga and G. Verret. Submitted to Europ. J. Combin.)
Semiregular automorphisms of cubic vertex-transitive graphs, (With P. Spiga and G. Verret. Submitted to Bull. London Math. Soc.)
Further restrictions on the structure of finite DCI-groups: an addendum, (With E. Dobson and P. Spiga. Submitted to J. Alg. Combin.)

(Note: Dates inside the above files represent the dates on which I converted them to .pdf form, and may bear no relation to their publication dates.)

I married Dave Morris in December of 2002. Here is a wedding photo.