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Published online by Cambridge University Press: 22 January 2016
Let Ω be a bounded domain in Rl (l ≥ 2) with, C ∞ boundary Γ of dimension l — 1 and let there be given a second order elliptic differential equation
(1)
in Ω,
where ∂j = ∂/∂xi and all coefficients are assumed, for the sake of simplicity, to be real-valued and C ∞ on
.