most citedRearrangement Invariant Orthogonal Sums in Krein Spaces. II

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math.FA2026★ 1 cited

Rearrangement Invariant Orthogonal Sums in Krein Spaces. II

Michael A. Dritschel, Alejandra Maestripieri, James Rovnyak

Part I of the paper considered infinite orthogonal sums of regular subspaces in a Krein space (that is, of subspaces which are themselves Krein spaces). How precisely these sums sh…

math.FA2026

Hermitian indices and factorization of selfadjoint operators on a KreÄ­n space

Michael A. Dritschel, Alejandra Maestripieri, James Rovnyak

The hermitian indices of a selfadjoint operator on a KreÄ­n space are defined as geometric measures of positivity and negativity of the operator. A different pair…