Published online by Cambridge University Press: 24 October 2008
Let G be a bounded region in k-dimensional space, with boundary Γ, such that the Laplace equation,
is uniquely soluble (to within an added constant) under the Neumann boundary conditions
where ∂/∂n denotes outward normal differentiation on Γ, and it is assumed that h is a function in G ∪ ∂, and thus that g is a function on ∂. In what follows, we shall assume certain properties of the solution h: these are all well known (see, for example, Osgood(l) or Courant(2)).