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Constructible sheaf complexes in complex geometry and applications. (English) Zbl 1504.32025

Cisneros-Molina, José Luis (ed.) et al., Handbook of geometry and topology of singularities III. Cham: Springer. 679-791 (2022).
Summary: We present a detailed introduction of the theory of constructible sheaf complexes in the complex algebraic and analytic setting. All concepts are illustrated by many interesting examples and relevant applications, while some important results are presented with complete proofs. This paper is intended as a broadly accessible user’s guide to these topics, providing the readers with a taste of the subject, reflected by concrete examples and applications that motivate the general theory. We discuss the stability of constructible sheaf complexes under the standard functors, and explain the relation of these functors to perverse sheaves and the perverse t-structure. We introduce the main results of stratified Morse theory in the framework of constructible sheaves, for proving the basic vanishing and finiteness results. Applications are given to various index theorems, the functorial calculus of characteristic cycles of constructible functions, and to weak Lefschetz and Artin-Grothendieck type theorems. We recall the construction of Deligne’s nearby and vanishing cycle functors, prove that they preserve constructible complexes, and discuss their relation with the perverse t-structure. We finish this paper with a description and applications of the Kähler package for intersection cohomology of complex algebraic varieties, and the recent study of perverse sheaves on semi-abelian varieties.
For the entire collection see [Zbl 1487.32005].

MSC:

32C38 Sheaves of differential operators and their modules, \(D\)-modules
14F10 Differentials and other special sheaves; D-modules; Bernstein-Sato ideals and polynomials
32-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to several complex variables and analytic spaces
14-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to algebraic geometry

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