Abstract

For any holomorphic symplectic manifold (X,¾), a closed Jacobi diagram with 2k trivalent vertices gives rise to a Rozansky- Witten class RWX,¾(i) 2 H 2k (X,OX). If X is irreducible, this defines a number ¯i(X,¾) by RWX,¾(i) = ¯i(X,¾)(¯¾) k .

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