Radiation condition

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A prescribed value of a solution or its derivative or some combination on a mathematical surface in a problem. Such a surface need not be the confining surface of a finite volume, but may be any desired surface. When a medium is unbounded the surface which contains it is taken to be infinitely distant from the source and receiver. Radiation conditions are the boundary condition for the boundary at infinity. A radiation condition is necessary to guarantee a unique solution in physical science problems.