Duvenhage, Rocco de Villiers2012-10-022012-10-022012Duvenhage, R 2012, 'Relatively independent joinings and subsystems of W*-dynamical systems', Studia Mathematica, vol. 209, no. 1, pp. 21-41.0039-3223 (print)1730-6337 (online)10.4064/sm209-1-3http://hdl.handle.net/2263/19944Relatively independent joinings ofW*-dynamical systems are constructed. This is intimately related to subsystems of W*-dynamical systems, and therefore we also study general properties of subsystems, in particular fixed point subsystems and compact subsystems. This allows us to obtain characterizations of weak mixing and relative ergodicity, as well as of certain compact subsystems, in terms of joinings.en© Instytut Matematyczny PAN, 2012W*-dynamical systemsRelatively independent joiningsSubsystemsPostprint Article