2014•Differential EquationsRequires access

Fredholm property of boundary value problems for a fourth-order elliptic differential-operator equation with operator boundary conditions

B. A. Aliev, Ya. Yakubov

Abstract

In a Hilbert space H , we study the Fredholm property of a boundary value problem for a fourth-order differential-operator equation of elliptic type with unbounded operators in the boundary conditions. We find sufficient conditions on the operators in the boundary conditions for the problem to be Fredholm. We give applications of the abstract results to boundary value problems for fourth-order elliptic partial differential equations in nonsmooth domains.

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Key concepts: Mathematics, Poincaré–Steklov operator, Boundary value problem, Parametrix, Elliptic operator, Semi-elliptic operator, Free boundary problem, Fredholm theory