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math.FA2021
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…
math.FA2021
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…