Hi,I have a reference request regarding associated points of sheaves. I'll be more specific, assume that we are given the following exact sequence on $\mathbb{P}^d_{\mathbb{C}}$: $0 \to \mathcal{O}(-1)^n \to \mathcal{O}^m \to \mathcal{C} \to 0$. I'm studying the degeneracy locus of $\mathcal{C}$. The case of interest to me is not the generic case, i.e. when the degeneracy locus does not have the expected codimension. I was wondering whether there are some known results regarding embedded points, specifically under what conditions do they appear.

Thank you!

`$\left(\begin{array}{c} m \\ n \end{array}\right)$`

sections of $\mathcal O(m)$? You are looking for embedded points of this determinant ideal? – Will Sawin Mar 25 '13 at 23:09