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基本説明
The central theme of this book is the restoration of Poincaré duality on stratified singular spaces by using Verdier-self-dual sheaves such as the prototypical intersection chain sheaf on a complex variety.
Full Description
The homology of manifolds enjoys a remarkable symmetry: Poincaré duality. In a manifold, the dual block is a cell, so the chain complex based on the dual blocks computes the homology of the manifold. Classifying manifolds via the surgery program relies on modifying a manifold by executing geometric surgeries.



