Exact Asymptotic Expansion of Singular Solutions for the (2 + 1)‐D Protter Problem
Exact Asymptotic Expansion of Singular Solutions for the (2 + 1)‐D Protter Problem
We study three‐dimensional boundary value problems for the nonhomogeneous wave equation, which are analogues of the Darboux problems in ℝ 2 . In contrast to the planar Darboux problem the three‐dimensional version is not well posed, since its homogeneous adjoint problem has an infinite number of classical solutions. On the …