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math.FA2019
Towards Generalized Riesz Systems Theory
Alan Kamuda, Sergiusz Kużel
Pseudo-Hermitian Hamiltonians have recently become a field of wide investigation. Originally, the Generalized Riesz Systems (GRS) have been introduced as an auxiliary tool in this…
math.FA2018
On -frames related to maximal definite subspaces
Alan Kamuda, Sergiusz Kużel
A definition of frames in Krein spaces is proposed which extends the concept of -frames defined by J.I. Giribet et al., J. Math. Anal. Appl. (2012), 122-137. Th…