21 citations · 126 across the 34 of their papers we have counts for
Showing 2014 · math.FAShow all
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math.FA2014★ 3 cited
On the sum between a closable operator and a -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 and acting between Hilbert spaces and , respectively and which satisfy the relation \begin…