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math.FA2013
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…
math.FA2013
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…