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Symmetric and Isometric Relations

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Abstract

Here the basic properties of two classes of (multi-valued) operators between Kreĭn spaces are presented: the symmetric and isometric relations. Both types of multi-valued operators (relations) naturally appear for instance when studying differential equation; for example Sturm–Liouville equations with an indefinite weight.

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Correspondence to Hendrik Luit Wietsma .

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Wietsma, H.L. (2015). Symmetric and Isometric Relations. In: Alpay, D. (eds) Operator Theory. Springer, Basel. https://doi.org/10.1007/978-3-0348-0667-1_42

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