We owe the T-shirt design and our 2010 contest logo to Dr. Martin Laubinger, a former graduate student of LSU Math Department.

This figure shows the Serre-tree associated with the p-adic Lie group SL₂(Q2). This tree is a geometric object which plays a role analogous to that of the upper half plane in the theory of SL₂(R). In particular, the tree is a metric space (with a Z-valued metric), and the group acts transitively by isometries. We sketch how to construct the tree.