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Generalized Riesz systems and orthonormal sequences in Krein spaces (1810.05218v3)
Published 11 Oct 2018 in math-ph and math.MP
Abstract: We analyse special classes of biorthogonal sets of vectors in Hilbert and in Krein spaces, and their relations with $\mathcal{G}$- quasi bases. We also discuss their relevance in some concrete quantum mechanical system driven by manifestly non self-adjoint Hamiltonians.
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