Let Ω be an exterior domain in R~2 with a compact C~2 boundary αΩWithout loss of generality we may assume (0, 0) ∈1/Ω. In this paper, we will consider the Cauchy-Dirichlet problem for the wave equation on exterior domains: For a function u = u(t, x) defined for (t, x) ∈ (0, ∞) .
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