The Dirichlet-to-Neumann operator for divergence form problems

A. F. M. ter Elst, G. Gordon, M. Waurick

Research output: Working paper

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We present a way of defining the Dirichlet-to-Neumann operator on general Hilbert spaces using a pair of operators for which each one's adjoint is formally the negative of the other. In particular, we define an abstract analogue of trace spaces and are able to give meaning to the Dirichlet-to-Neumann operator of divergence form operators perturbed by a bounded potential in cases where the boundary of the underlying domain does not allow for a well-defined trace. Moreover, a representation of the Dirichlet-to-Neumann operator as a first-order system of partial differential operators is provided. Using this representation, we address convergence of the Dirichlet-to-Neumann operators in the case that the appropriate reciprocals of the leading coefficients converge in the weak operator topology. We also provide some extensions to the case where the bounded potential is not coercive and consider resolvent convergence.
Original languageEnglish
Place of PublicationIthaca, NY.
Number of pages28
Publication statusPublished - 18 Jul 2017


  • Dirichlet-to-Neumann operator
  • resolvent convergence
  • continuous dependence on the coefficients


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  • The Dirichlet-to-Neumann operator for divergence form problems

    ter Elst, A. F. M., Gordon, G. & Waurick, M., 6 Feb 2019, In: Annali di Matematica Pura ed Applicata. 198, 1, p. 177-203 27 p.

    Research output: Contribution to journalArticlepeer-review

    Open Access
    5 Citations (Scopus)
    80 Downloads (Pure)

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