Duvenhage, Rocco de VilliersKing, Malcolm2021-02-232021-01Duvenhage, R., King, M. Relative discrete spectrum of W*-dynamical system. Banach Journal of Mathematical Analysis 15, 2 (2021). https://doi.org/10.1007/s43037-020-00089-4.2662-2033 (print)1735-8787 (online)10.1007/s43037-020-00089-4http://hdl.handle.net/2263/78815A definition of relative discrete spectrum of noncommutative W*-dynamical systems is given in terms of the basic construction of von Neumann algebras, motivated from three perspectives: First, as a complementary concept to relative weak mixing of W*-dynamical systems. Second, by comparison with the classical (i.e., commutative) case. And, third, by noncommutative examples.en© Springer Nature 2020. The original publication is available at : https://www.springer.com/journal/43037.W*-dynamical systemsRelative discrete spectrumRelative weak mixingRelatively independent joiningsPostprint Article