American Mathematical Society 2009 Spring Eastern Section Meeting Worcester, MA, April 25-26, 2009.

Special Session on Algebraic Graph Theory, Association Schemes, and Related Topics

Speakers and Titles

Schedule of Talks for Special Session SS 8A, Meeting #1050

Vladimir Nikiforov, University of Memphis, USA The spectral radius of monotone graph properties Edwin R. van Dam, Tilburg University, The Netherlands Almost distance-regular graphs Half-hour break Sebastian M. Cioaba, University of Delaware, USA Eigenvalues and connectivity of regular graphs Miklos Bona, University of Florida, USA The Average Number of Block Interchanges Needed to Sort A Permutation (co-author: Ryan T. Flynn) Paul-Hermann Zieschang, University of Texas at Brownsville, USA On association schemes with thin thin residue

Mikhail E. Muzychuk, Netanya Academic College, Israel On pseudocyclic association schemes (co-author: I. N. Ponomarenko) Aleksandar Jurisic, University of Ljubljana, Slovenia Distance-regular graphs with tails (co-author: Paul Terwilliger) Jianmin Ma, Oxford College of Emory University, USA Nonexistence of Certain Amorphous Association Schemes Paul Terwilliger, University of Wisconsin, USA Towards a classification of the tridiagonal pairs John Caughman, Portland State University, USA An Inequality for Leonard Systems Brian W. Curtin, University of South Florida, USA Leonard pairs associated with sl2 (co-author: Hasan Alnajjar)

Sunday, April 26 8:00--11:00 Chris D. Godsil, University of Waterloo, Canada Cocliques and Polytopes Leif K. Jorgensen, Aalborg University, Denmark Directed quotient graphs of bipartite graphs Robert Bailey, Carleton University, Canada Base size, metric dimension and other stories Tim Penttila, Colorado State University, USA Hemisystems of unitary spaces Andrew J. Woldar, Villanova University, USA The Combinatorics of Transitive Extensions (co-authors: Mikhail H. Klin, Dale M. Mesner) Junhua Wu, Worcester Polytechnic Institute, USA A binary linear code and its combinatorial properties

Sunday, April 26 15:00--18:00 Sejeong Bang, Pusan National University, Republic of Korea The Bannai-Ito Conjecture (co-authors: J. H. Koolen, V. Moulton) Jason Williford, University of Colorado at Denver, USA Q-polynomial association schemes which are not generated by a distance-regular graph Hajime Tanaka, Tohoku University, Japan Dual-tight cometric association schemes (co-authors: Sho Suda, Rie Tanaka) Etsuko Bannai, Fukuoka, Japan Euclidean designs and coherent configurations Hiroshi Suzuki, International Christian University, Japan Distance-Regular Graphs Having Certain Completely Regular Subgraphs Sung Y. Song, Iowa State University, USA Terwilliger algebras of wreath products of one-class association schemes (co-authors: Gargi Bhattacharyya, Rie Tanaka)

Other Scheduled Events

• Informal Workshop on Association Schemes Monday, April 27th
  This meeting will be held in the Mid-Century Room of the Campus Center, with a small number of talks, of varying lengths, running roughly 9:30-noon and 2-5:30. Please notify Bill Martin if you are interested in attending. We have about two dozen participants as of April 15.
• Reception hosted by the Department of Mathematical Sciences Saturday, April 25th, 6pm
  This will be a pre-dinner party for all conference participants, held in Higgins House, an old English mansion on the WPI campus.
• Session Dinner Saturday Night
  We will have a dinner together on Saturday night April 25 starting at 7:15pm. The invitees will receive e-mail about the details. Any session speaker is free to bring a guest. If you are aware of others who may be appropriate dinner guests, please contact Bill Martin and I will add those persons to my e-mail list.
• Worcester Art Museum (free on Saturday morning)
  Worcester is a small city but has a fairly nice art museum which is very close to campus. If you enter between 10am and noon on a Saturday, then admission is free. The museum has a cafe, so art fans may wish to take their Saturday lunch break at the museum. Contact Bill Martin for details.
• Travel and Maps
  WPI has a nice web page with maps of the campus and surrounding area, along with links to airport shuttles and so on.