2 papers
math.FA2025
Product of nonnegative selfadjoint operators in unbounded settings
Yosra Barkaoui, Seppo Hassi
In this paper, necessary and sufficient conditions are established for the factorization of a closed, in general, unbounded operator into a product of two nonnegative selfad…
math.FA2025
An extension and refinement of the theorems of Douglas and Sebestyén for unbounded operators
Yosra Barkaoui, Seppo Hassi
For a closed densely defined operator from a Hilbert space to a Hilbert space , necessary and sufficient conditions are established for the factori…