Quasi-unitary equivalence and generalised norm resolvent convergence

Published 28 Mar 2025 in math.SP | (2503.22611v1)

Abstract: The purpose of this article is to give a short introduction to the concept of quasi-unitary equivalence of quadratic forms and its consequences. In particular, we improve an estimate concerning the transitivity of quasi-unitary equivalence for forms. We illustrate the abstract setting by two classes of examples.

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