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Spécialisation de faisceaux et monodromie modérée. (French) Zbl 0532.14008
Astérisque 101-102, 332-364 (1983).
Given an analytic subspace Y of an analytic space X, this paper defines in an intrinsic way a ”specialization” functor $$Sp_{Y\backslash X}:D_{const}(X)\to D_{const}(C_{Y\backslash X})$$ from the (derived) category of constructible sheaves on X to the (derived) category of constructible sheaves on the normal cone to Y in X; the sheaves thus obtained are locally constant along the punctured generatrices of the normal cone, and in the special case of a divisor Y defined by a local equation f they correspond to Deligne’s ”sheaves of vanishing cycles” $$R^ i\psi_ f$$. - The p characteristic and the complex case are discussed separately.
For the entire collection see [Zbl 0515.00021].
Reviewer: F.Pham

##### MSC:
 14F05 Sheaves, derived categories of sheaves, etc. (MSC2010) 14F40 de Rham cohomology and algebraic geometry 14F25 Classical real and complex (co)homology in algebraic geometry 32L10 Sheaves and cohomology of sections of holomorphic vector bundles, general results 32C25 Analytic subsets and submanifolds