The defining ideals of conjugacy classes of nilpotent matrices and a conjecture of Weyman

Details The defining ideals of conjugacy classes of nilpotent matrices and a conjecture of Weyman The defining ideals of conjugacy classes of nilpotent matrices and a conjecture of Weyman

2008-03-05

arxiv.org/abs/0803.0658v1

Mathematics

Commutative Algebra

Scientific paper

Tanisaki introduced generating sets for the defining ideals of the schematic intersections of the closure of conjugacy classes of nilpotent matrices with the set of diagonal matrices. These ideals are naturally labeled by integer partitions. Given such a partition $\lambda$, we define several methods to produce a reduced generating set for the associated ideal $I_{\lambda}$. For particular shapes we find nice generating sets. By comparing our sets with some generating sets of $I_{\lambda}$ arising from a work of Weyman, we find a counterexample to a related conjecture of Weyman.

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