文摘
Given a generic map between flagged vector bundles on a Cohenx2013;Macaulay variety, we construct maximal Cohenx2013;Macaulay modules with linear resolutions supported on the Schubert-type degeneracy loci. The linear resolution is provided by the Schubert complex, which is the main tool introduced and studied in this paper. These complexes extend the Schubert functors of Kraśkiewicz and Pragacz, and were motivated by the fact that Schur complexes resolve maximal Cohenx2013;Macaulay modules supported on determinantal varieties. The resulting formula in K-theory provides a x201c;linear approximationx201d; of the structure sheaf of the degeneracy locus, which can be used to recover a formula due to Fulton.