Locally acyclic morphism

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In algebraic geometry, a morphism f: X \to S of schemes is said to be locally acyclic if, roughly, any sheaf on S and its restriction to X through f have the same étale cohomology, locally. For example, a smooth morphism is universally locally acyclic.

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References[edit]

  • Milne, J. S. (1980), Étale cohomology, Princeton Mathematical Series 33, Princeton, N.J.: Princeton University Press .