## Microlocal study of sheaves.(English)Zbl 0589.32019

Astérisque, 128. Publié avec le concours du Centre National de la Recherche Scientifique. Paris: Société Mathématique de France. 235 p. FF 135.00; \$ 16.00 (1985).
This book deals with a microlocalization of a sheaf $${\mathcal F}$$ on a real manifold M. Originally microlocal analysis means an analysis of a hyperfunction f(x) on a real analytic manifold by considering it as a microfunction on the cotangent bundle $$T^*M$$ and studying it as a section on $$T^*M$$. The sheaves $${\mathcal B}_ M$$ of hyperfunctions on M and $${\mathcal C}_ M$$ of microfunctions on $$T^*M$$ are constructed through cohomological operations of $${\mathcal O}_ X:$$ the sheaf of holomorphic functions on the complexification X of M. For a section f(x) of a hyperfunction, the support of f(x) as a microfunction on $$T^*M$$ is called the singular support or singular spectrum and plays a fundamental role in microlocal analysis.
The authors define the same notion as singular support for any sheaf $${\mathcal F}$$ on a real manifold M and call it the micro-support. It is a closed conic involutive subset of $$T^*X$$, describing the set of codirections where $${\mathcal F}$$ and its cohomology do not propagate. Functorial properties of the micro-support are studied, and the derived category of sheaves is localized in $$T^*M$$, which gives a meaning to the action of contact transformations on sheaves. In particular the shift of simple sheaves along smooth Lagrangian manifolds is calculated by means of the Maslov index. Applications are given to real or complex analytic constructible sheaves, regular holonomic modules, and micro- differential systems.
Reviewer: M.Muro

### MSC:

 32C05 Real-analytic manifolds, real-analytic spaces 32-02 Research exposition (monographs, survey articles) pertaining to several complex variables and analytic spaces 58J40 Pseudodifferential and Fourier integral operators on manifolds 32A45 Hyperfunctions 46F15 Hyperfunctions, analytic functionals 18F99 Categories in geometry and topology 55R40 Homology of classifying spaces and characteristic classes in algebraic topology 35N99 Overdetermined problems for partial differential equations and systems of partial differential equations 32L99 Holomorphic fiber spaces