The Global Nature of the Arrow of Time and the Bohm-Reichenbach diagram
  The importance of the global nature of the arrow of time is shown. Classical Reichenbach diagram and quantum Bohm-Reichenbach diagram, for the universe are introduced. They are used to show the increase of entropy in closed systems, the global nature of the quantum measurement, and the relation among the different arrows of time. 
Mario A. Castagnino