Abstract
ABSTRACT The notion of primary shadow radiation is introduced. This is a wave field created by the transverse diffusion in the vicinity of the geometrical optics boundary behind a black screen with a special property. This special screen is located on the boundary between two neighboring Rieman spaces and consists of two faces. These faces together are not transparent to the wave field; but, each separately is transparent. We call this screen the Riemann black screen. The well known classical models of black screens are interpreted as special sets of Rieniann screens.
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