The primitive definition of global efficiency for a complex network 2 b (N-1)分l It is irrelevant to either the function of a network or to the state of any node, which is abnormal from the viewpoint of statistical physICS• The primitive definition of global efficiency for a complex network • It is irrelevant to either the function of a network or to the state of any node, which is abnormal from the viewpoint of statistical physics 2 1 ( 1) glob i j ij E N N l  = − 