Classes of states of discrete systems
  We present a method which allows reduction of a size of a simulated system. The method can be applied to any system where one can define a finite set of possible states of the system and an elementary process which transforms one state of the system to another. The method is based on the symmetry of the system symmetry; we get classes of states, which can be used instead of states. We present a detailed procedure for undirected/directed and/or unweighted/weighted graphs. We show applications of the method for different types of systems. 
Malgorzata J. Krawczyk
physics.comp-ph