 97579 F. Gesztesy, K. A. Makarov, and E. Tsekanovskii
 An Addendum to Krein's Formula
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Nov 18, 97

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Abstract. We provide additional results in connection with Krein's formula, which
describes the resolvent difference of two selfadjoint extensions $A_1$
and $A_2$ of a densely defined closed symmetric linear operator $\dot A$
with deficiency indices $(n,n),$ $n\in \bbN \cup \{ \infty \}$.~In
particular, we explicitly derive the linear fractional transformation
relating the
operatorvalued WeylTitchmarsh $M$functions $M_1(z)$ and $M_2(z)$
corresponding to $A_1$ and $A_2$.
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