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    El-Gebeily, M.A. O’Regan, Donal and Agarwal, Ravi 2011. Characterization of self-adjoint ordinary differential operators. Mathematical and Computer Modelling, Vol. 54, Issue. 1-2, p. 659.

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THE BOUNDARY CONDITIONS DESCRIPTION OF TYPE I DOMAINS

  • MOHAMED EL-GEBEILY (a1) and DONAL O'REGAN (a2)
Abstract
Abstract

Type I domains are the domains of the self-adjoint operators determined by the weak formulation of formally self-adjoint differential expressions ℓ. This class of operators is defined by the requirement that the sesquilinear form q(u, v) obtained from ℓ by integration by parts agrees with the inner product 〈ℓu, v〉. A complete characterisation of the boundary conditions assumed by functions in these domains for second-order differential expressions is given in this paper. In the singular case, the boundary conditions are stated in terms of certain ‘boundary condition’ functions and in the regular case they are given in terms of classical function values.

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COPYRIGHT: © Glasgow Mathematical Journal Trust 2010
References
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