4 citations · 4 across the 1 of their papers we have counts for
2 papers
math-ph2019★ 4 cited
Generalized Riesz systems and orthonormal sequences in Krein spaces
Fabio Bagarello, Sergiusz Kużel
We analyze special classes of bi-orthogonal sets of vectors in Hilbert and in Krein spaces, and their relations with generalized Riesz systems. In this way, the notion of the first…
math-ph2018
Generalized Riesz systems and orthonormal sequences in Krein spaces
Fabio Bagarello, Sergiusz Kuzhel
We analyse special classes of biorthogonal sets of vectors in Hilbert and in Krein spaces, and their relations with - quasi bases. We also discuss their relevance in s…