21 citations · 21 across the 5 of their papers we have counts for
7 papers
Approximately invertible elements in non-unital normed algebras
Kevin Esmeral, Hans G. Feichtinger, Ondrej Hutník +1
We introduce a concept of approximately invertible elements in non-unital normed algebras which is, on one side, a natural generalization of invertibility when having approximate i…
Continuous frames in Krein spaces
Diego Carrillo, Kevin Esmeral, Elmar Wagner
The purpose of this paper is to propose a definition of continuous frames of rank n for Krein spaces and to study their basic properties. Similarly to the Hilbert space case, conti…
-invariant Fock-Carleson type measures for derivatives of order and the corresponding Toeplitz operators
Kevin Esmeral, Grigori Rozenblum, Nikolai Vasilevski
Our purpose is to characterize the so-called horizontal Fock-Carleson type measures for derivatives of order (we write it -hFC for short) for the Fock space as well as the T…
Radial Toeplitz operators on the Fock space and square-root-slowly oscillating sequences
Kevin Esmeral, Egor A. Maximenko
In this paper we show that the C*-algebra generated by radial Toeplitz operators with -symbols acting on the Fock space is isometrically isomorphic to the C*-algebra of…
Construction, Extension and Coupling of Frames on Finite Dimensional Pontryagin Space
German Escobar, Kevin Esmeral, Osmin Ferrer
In this paper we extend to finite-dimensional Pontryagin spaces the methods used in \cite{CasazzaLeon,Deguang} to build frames from an adjoint and positive operator. It is proved t…
Frames of subspaces in Hilbert spaces with -metrics
Primitivo Acosta-Humánez, Kevin Esmeral, Osmin Ferrer
If $\left(\h,\langle\cdot,\cdot\rangle\right)$ is a Hilbert space and on it we consider the sesquilinear form so-called -metric, where $W^{*}=W\in…
Frames in Krein spaces arising from a non-regular W-metric
Kevin Esmeral, Osmin Ferrer, Elmar Wagner
A definition of frames in Krein spaces is stated and a complete characterization is given by comparing them to frames in the associated Hilbert space. The basic tools of frame theo…