A New Approach to Characterise all the Transitive Orientations for an   Undirected Graph
  A new approach to find all the transitive orientations for a comparability graph (finite or infinite) is presented. This approach is based on the link between the notion of ``strong'' partitive set and the forcing theory (notions of simplices and multiplices). A mathematical algorithm is given for the case of a comparability graph which has only non limit sub-graphs. 
A. Belkasri, M. Hamade