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arXiv math/0610299math.SP
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对称算子的边界关系和广义预解式

Boundary relations and generalized resolvents of symmetric operators

Vladimir Derkach, Seppo Hassi, Mark Malamud, Henk de Snoo

摘要:

Kre \u <$n-Naimark公式提供了一个对称算子的所有自伴出口空间扩张的参数化,不一定是稠密定义的,根据参数空间上的最大耗散(在$\dC_+$中)全纯线性关系(所谓的Nevanlinna族)。边界关系的新概念使我们有可能解释这些参数族作为Weyl族的边界关系,并建立一个简单的耦合方法来构造广义预解式从给定的参数族。介绍了耦合方法的一般形式,并研究和解释了Kre \u ın-Naimark公式中边界关系及其Weyl族的作用。

英文摘要:

The Kre\uın-Naimark formula provides a parametrization of all selfadjoint exit space extensions of a, not necessarily densely defined, symmetric operator, in terms of maximal dissipative (in $\dC_+$) holomorphic linear relations on the parameter space (the so-called Nevanlinna families). The new notion of a boundary relation makes it possible to interpret these parameter families as Weyl families of boundary relations and to establish a simple coupling method to construct the generalized resolvents from the given parameter family. The general version of the coupling method is introduced and the role of boundary relations and their Weyl families for the Kre\uın-Naimark formula is investigated and explained.

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