nonflat
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Pp-wave spacetime — In general relativity, the pp wave spacetimes, or pp waves for short, are an important family of exact solutions of Einstein s field equation. These solutions model radiation moving at the speed of light. This radiation may consist of:*… … Wikipedia
Soft lithography — In technology, soft lithography refers to a family of techniques for fabricating or replicating structures using elastomeric stamps, molds, and conformable photomasks (in the words of Rogers and Nuzzo, p. 50, as cited in References ). It is… … Wikipedia
