Ferrer, OsminSierra, ArleyPolo, Osvaldo2023-02-022023-02-022022https://repositorio.unicordoba.edu.co/handle/ucordoba/6991In this paper, we introduce the concept of orthogonal frames in Krein spaces, prove the independence of the choice of the fundamental symmetry, and from this, we obtain a number of interesting properties that they satisfy. We show that there is no distinction between orthogonal frames in a Krein space and orthogonal frames in its associated Hilbert. Furthermore, we characterize frames dual to a given frame, which is a useful tool for constructing examples.application/pdfengCopyright Universidad de Córdoba, 2023Artículo de revistahttps://doi.org/10.3390/math10193588info:eu-repo/semantics/openAccessAtribución-NoComercial-SinDerivadas 4.0 Internacional (CC BY-NC-ND 4.0)Krein spaceFundamental symmetryHilbert associatedFrames