Maciej P. Wojtkowski
THE  SYSTEM OF TWO SPINNING DISKS IN THE TORUS
(28K, AMSTeX)

ABSTRACT.  We study the system of two spinning disks in the  torus.  We show how to
reduce this nonhamiltonian system to a 3 dimensional measure
preserving reversible map.  We establish that, in contrast to the
case of elastic collisions, this system may have periodic orbits with
all Floquet exponents on the unit circle.