Rocky Mountain Algebraic Combinatorics Seminar

A quasi-explanation of Babai's 'Graph isomorphism in Quasi-polynomial time'

James Wilson
Colorado State University

We give a report on the material steps in the recently reported breakthrough on the complexity of graph isomorphism. We also place the result into context and describe the importance of the split-or-Johnson theorem which underpins the recent algorithm. This talk will be accessible to students in computer science and mathematics.


The Exact Cover and Clique Finding Problems in Combinatorics

Anton Betten
Colorado State University

The problem of searching and classifying combinatorial objects can often be reduced to solving instances of the exact cover problem or the clique finding problem in graphs. We wish to present this technique in the context of the opportunistic and the systematic approach to finding and classifying combinatorial objects. As an application, we will look at regular packings in projective space.


Weber 223
4–6 pm
Friday, February 19, 2015
(Refreshments in Weber 117, 3:30–4 pm)
Colorado State University

This is a joint Denver U / UC Boulder / UC Denver / U of Wyoming / CSU seminar that meets biweekly. Anyone interested is welcome to join us at a local restaurant for dinner after the talks.

PDF version

Previous Seminars:

December 4, 2015
Maria Monks Gillespie, Dane Flannery
November 13, 2015
Richard Green, Tim Penttila
October 23, 2015
Christina Boucher, Sylvia Hobart
October 9, 2015
Josh Maglione, Ghodratollah Aalipour
September 25, 2015
Ross McConnell, Henry Adams
September 11, 2015
James B. Wilson, Tim Penttila
May 8, 2015
Amanda Schaeffer Fry, Peter Brooksbank
April 24, 2015
Heide Gluesing-Luerssen, Phil DeOrsey
March 6, 2015
Felice Manganiello, Eric Moorhouse
February 20, 2015
Anton Dzhamay, Anton Betten
February 6, 2015
Alexander Hulpke, Morgan Rodgers
December 5, 2014
Stefaan De Winter, Gretchen Matthews
November 14, 2014
Greg Coxson, Tom Dorsey
October 31, 2014
Octavio Paez Osuna, Sylvia Hobart
October 10, 2014
Takunari Miyazaki, Eric Moorhouse
September 26, 2014
Elissa Ross, Anton Betten
September 12, 2014
Petr Vojtěchovský, Alexander Hulpke
May 9, 2014
Philip DeOrsey, Tim Penttila
April 25, 2014
William J Martin, Jason Williford
April 11, 2014
Victor Pambuccian, George Shakan
March 7, 2014
Nathan Lindzey, Jens Harlander
February 21, 2014
Ross McConnell, Anton Betten
November 22, 2013
Justin Hughes, Josh Maglione

Department of Mathematics
Fort Collins, Colorado 80523