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 ...

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 ...

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 ...

Algebraic geometry has long provided a deep framework for understanding the solutions of polynomial equations through geometric lenses. In recent years, tropical geometry – a relatively young field – ...