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Algebraic construction of Witten's top Chern class

Alexander Polishchuk, Arkady Vaintrob

math.AGarXiv:math/0011032

Abstract

We give a construction of Witten's "top Chern class" on the compactified moduli space of curves with higher spin structures and show that it satisfies most of the axioms proposed in math.AG/9905034.

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