= Dirichlet-to-Neumann map
{c}
{title2=$\Lambda:g\mapsto\partial_nu$}
= Dirichlet-to-Neumann operator
{c}
{synonym}
Given a uniquely solvable <Dirichlet problem>, this map sends prescribed <Dirichlet boundary data> to the solution's outward <normal derivative>. It depends on the differential operator and domain. Spectral <global relations> offer one way to compute it numerically from boundary traces, while a finite collocation scheme still requires a rank and conditioning check.
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