Classical and Quantum Dynamics on Orbifolds
  We present two versions of the Egorov theorem for orbifolds. The first one is a straightforward extension of the classical theorem for smooth manifolds. The second one considers an orbifold as a singular manifold, the orbit space of a Lie group action, and deals with the corresponding objects in noncommutative geometry. 
Yuri A. Kordyukov
math.DG math.DS