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Published online by Cambridge University Press: 16 July 2025
ABSTRACT. This paper is an extended version of an expository talk given at the workshop “Topology of Stratified Spaces” at MSRI in September 2008. It gives an introduction and overview about recent developments on the interaction of the theories of characteristic classes and mixed Hodge theory for singular spaces in the complex algebraic context.
It uses M. Saito's deep theory of mixed Hodge modules as a black box, thinking about them as “constructible or perverse sheaves of Hodge structures”, having the same functorial calculus of Grothendieck functors. For the “constant Hodge sheaf”, one gets the “motivic characteristic classes” of Brasselet, Schürmann, and Yokura, whereas the classes of the “intersection homology Hodge sheaf” were studied by Cappell, Maxim, and Shaneson. The classes associated to “good” variation of mixed Hodge structures where studied in connection with understanding the monodromy action by these three authors together with Libgober, and also by the author.
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