A Spectral Sobolev Problem for the Biharmonic Operator vanishing on a circle inside the torus. We describe explicitly the adjoint operator and the
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Sectorial differential-difference operators with degeneration with degeneracy containing several different difference operators and constructed the
Friedrichs extension
К теории Бирмана–Крейна–Вишика Hilbert space ℌ, let ${{\hat {A}}_{F}}$ and ${{\hat {A}}_{K}}$ be its
Friedrichs and Krein extensions