Monthly Archives: October 2011

Ziggurats and the Slippery Conjecture

A couple of months ago I discussed a method to reduce a dynamical problem (computing the maximal rotation number of a prescribed element  in a free group given the rotation numbers of the generators) to a purely combinatorial one. Now Alden Walker … Continue reading

Posted in Dynamics | Tagged , , , , | Leave a comment

Zonohedra and the Sylvester-Gallai theorem

When I was in Melbourne recently, I spent some time browsing through a copy of “Twelve Geometric Essays” by Harold Coxeter in the (small) library at AMSI. One of these essays was entitled “The classification of zonohedra by means of … Continue reading

Posted in Polyhedra, Projective geometry | Tagged , , , | 4 Comments