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A technical mathematical object defined as the Spectrum 
 of a set of 
Prime Ideals of a commutative Ring 
 regarded as a local ringed space with a structure 
sheaf.
See also Scheme
References
Iyanaga, S. and Kawada, Y. (Eds.).  ``Schemes.''  §18E in
  Encyclopedic Dictionary of Mathematics.  Cambridge, MA: MIT Press, p. 69, 1980.