The Signature of the Chern Coefficients of Local Rings

Ghezzi, Laura; Hong, Jooyoun; Vasconcelos, Wolmer V.

The Signature of the Chern Coefficients of Local Rings

Authors

Ghezzi, Laura

Hong, Jooyoun

Vasconcelos, Wolmer V.

Description

This paper considers the following conjecture: If $R$ is an unmixed, equidimensional local ring that is a homomorphic image of a Cohen-Macaulay local ring, then for any ideal $J$ generated by a system of parameters, the Chern coefficient $e_1(J)< 0$ is equivalent to $R$ being non Cohen-Macaulay. The conjecture is established if $R$ is a homomorphic image of a Gorenstein ring, and for all universally catenary integral domains containing fields. Criteria for the detection of Cohen-Macaulayness in equi-generated graded modules are derived.
Example 3.8 (in pages 8-9) is revised