A scheme over a base is separated when its structure morphism to is a separated morphism. An absolute scheme is usually called separated when it is separated over .
An algebraic variety that is separated over its ground field. Two affine open charts have an affine intersection: their intersection is the inverse image of the closed diagonal inside the product of the two affine charts. This ensures a finite affine cover is acyclic for quasi-coherent sheaves.

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  1. Separated morphism
  2. Morphism of schemes
  3. Scheme
  4. Locally ringed space
  5. Ringed space
  6. Algebraic geometry
  7. Geometry and topology
  8. Area of mathematics
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