Zoltán Sebestyén

most citedOn the sum between a closable operator

T

and a

T

-bounded operator

3 citations · 3 across the 3 of their papers we have counts for

collaborators

3 papers

math.FA2022

Extensions of positive symmetric operators and Krein's uniqueness criteria

Zoltán Sebestyén, Zsigmond Tarcsay

We revise Krein's extension theory of positive symmetric operators. Our approach using factorization through an auxiliary Hilbert space has several advantages: it can be applied to…

math.FA2014★ 3 cited

On the sum between a closable operator $T$ and a $T$ -bounded operator

Dan Popovici, Zoltán Sebestyén, Zsigmond Tarcsay

We provide several perturbation theorems regarding closable operators on a real or complex Hilbert space. In particular we extend some classical results due to Hess--Kato, Kato--Re…

math.FA2014

On operators which are adjoint to each other

Dan Popovici, Zoltan Sebestyen

Given two linear operators $S$ and $T$ acting between Hilbert spaces $H$ and $K$ , respectively $K$ and $H$ which satisfy the relation \begin…

Extensions of positive symmetric operators and Krein's uniqueness criteria

On the sum between a closable operator T and a T-bounded operator

On operators which are adjoint to each other

On the sum between a closable operator $T$ and a $T$ -bounded operator