Template-Type: ReDIF-Paper 1.0 Title: P-energy o and orthogonality of martingales Author-Name: Schweizer,Martin Author-WorkPlace-Name: University of Bonn Classification-JEL: 211 Keywords: Orthogonality of martingales,Risk minimization,Martingales, P- energy o, Series: Sonderforschungsbereich 303 Creation-Date: 1989-03 Handle: RePEc:bon:bonsfb:122