A. P. Ugolʹnikov

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Articles: 2

Parametrization of scale-invariant self-adjoint extensions of scale-invariant symmetric operators

Miron B. Bekker, Martin J. Bohner, Alexander P. Ugolʹnikov, Hristo Voulov

↓ Abstract   |   Article (.pdf)

MFAT 24 (2018), no. 1, 1-15


On a Hilbert space $\frak H$, we consider a symmetric scale-invariant operator with equal defect numbers. It is assumed that the operator has at least one scale-invariant self-adjoint extension in $ \frak H$. We prove that there is a one-to-one correspondence between (generalized) resolvents of scale-invariant extensions and solutions of some functional equation. Two examples of Dirac-type operators are considered.

The Helson-Szegö theorem for operator-valued weight

Miron Bekker, A. P. Ugolʹnikov

MFAT 10 (2004), no. 3, 11-16


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