Journal of Operator Theory, Vol. 53, No. 1 (Winter 2005), pp. 197-220 (24 pages) It is known that if AB – BA is quasinilpotent for every A and B in a multiplicative semigroup 𝒮 of compact operators ...

This is a preview. Log in through your library . Abstract We determine the invariant subspaces M of L2(T2) for which there is a subspace S of M and a positive integer ...

The quantum Zeno effect restricts the evolution of repeatedly observed quantum systems. For a two-dimensional system the state simply is frozen in one of two eigenstates of the measurement operator ...

Device-independent method certifies genuinely entangled subspaces in photonic and superconducting systems by University of Science and Technology of China edited by Gaby Clark, reviewed by Robert Egan ...

Group gradings and Lie algebras are important concepts in algebra that help mathematicians understand the structure and properties of various algebraic systems. Group gradings involve the ...