Talks
Spring 2017

# Hidden Irregularity Versus Hidden Structure: The Emergence of the Johnson Graphs

Wednesday, April 12th, 2017 9:30 am10:30 am

The symmetry of a circle is easily destroyed: just individualize'' two non-opposite points -- color one of them red, the other blue -- and all the symmetry is gone.  In fact, the resulting structure is completely irregular: every point is uniquely identified by a pair of numerical invariants, namely, its pair of distances to the two individualized points. We shall say that the circle has a high degree of hidden irregularity.