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Structures · Category theory

CategoryTheory.Precoverage.IsStableUnderBaseChange

A precoverage is stable under base change if pullbacks of covering presieves are covering presieves. Use Precoverage.mem_coverings_of_isPullback for less universe restrictions. Note: This is stronger than the analogous requirement for a Pretopology, because IsPullback does not imply equality with the (arbitrarily) chosen pullbacks in C.

Defined in
Mathlib.CategoryTheory.Sites.Precoverage
Shape
One type argument · adds mem_coverings_of_isPullback

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Concrete types that are instances2

  • AlgebraicGeometry.Scheme
  • TopCat

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