Journal
MEDITERRANEAN JOURNAL OF MATHEMATICS
Volume 6, Issue 4, Pages 403-430Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00009-009-0015-6
Keywords
Formality of dg algebras; constructible derived category
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We describe the constructible derived category of sheaves on the n-sphere, stratified in a point and its complement, as a dg module category of a formal dg algebra. We prove formality by exploring two different methods. As a combinatorial approach, we reformulate the problem in terms of representations of quivers and prove formality for the 2-sphere, for coefficients in a principal ideal domain. We give a suitable generalization of this formality result for the 2-sphere stratified in several points and their complement. As a geometric approach, we give a description of the underlying dg algebra in terms of differential forms, which allows us to prove formality for n-spheres, for real or complex coefficients.
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