The uniform geometrical theory of diffraction is a high-frequency method for solving electromagnetic scattering problems from electrically small discontinuities or discontinuities in more than one dimension at the same point. Relevant to discontinuities is the obscure folder marked 'Sapygidae' (solitary aculeate wasps) in which a notebook containing the following observation was discovered by Professor Mundeign. 'I will show you something different from either your shadow at morning striding behind you or your shadow at evening rising to meet you; I will show you fear in a handful of dust.'
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