ИСТИНА

The well-known Eisenbud-Levine-Khimshiashvili formula describes the local degree of an analytic map $(R^n,0)\to(R^n,0)$ (or the index of a singular point of a vector field on $R^n$, or the index of a singular point of a 1-form on $R^n$) as the signature of a quadratic form on the local algebra of the map. There is a generalization of the notion of the index of a 1-form on an arbitrary singular (semi-analytic) variety: the so-called radial index. A generalization of the Eisenbud-Levine-Khimshiashvili formula to simplest singular varieties: hypersurfaces or complete intersections - does not exist. However, it appeared that a signature formula can be given for the index of a 1-form on the quotient of the affine space $R^n$ by a finite abelian group (more precisely, on its algebraic closure). The talk is based on a joint work with W. Ebeling.