Algebraic structures constitute a central theme in contemporary mathematics, encapsulating the interplay of operations on sets that adhere to specific axioms. The study of cohomology provides a ...

Given an exponentiable Lie algebra L of operators on a Hilbert space H, we study the spectrum of those self-adjoint, non-adnilpotent operators -iA, with A in L, for a certain class of solvable Lie ...

At the University of Vaasa in Finland, mathematician Yosra Barkaoui has successfully generalized a fundamental theorem that had remained confined to “bounded” systems for more than 40 years.