Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 47, No. 1, pp. 161166 (2006) 

A broken circuit ringNicholas Proudfoot and David SpeyerDepartment of Mathematics, University of Texas, Austin, TX 78712; Department of Mathematics, University of California, Berkeley, CA 94720Abstract: Given a matroid $M$ represented by a linear subspace $L\subset{\mathbb C}^n$ (equivalently by an arrangement of $n$ hyperplanes in $L$), we define a graded ring $R(L)$ which degenerates to the StanleyReisner ring of the broken circuit complex for any choice of ordering of the ground set. In particular, $R(L)$ is CohenMacaulay, and may be used to compute the $h$vector of the broken circuit complex of $M$. We give a geometric interpretation of $\Spec R(L)$, as well as a stratification indexed by the flats of $M$. Full text of the article:
Electronic version published on: 9 May 2006. This page was last modified: 4 Nov 2009.
© 2006 Heldermann Verlag
