On the ideal generated by all squarefree monomials of a given degree

 02 June 2020
 Mathematics - Research News

Federico Galetto. Source: Journal of Commutative Algebra, Volume 12, Number 2, 199--215.Abstract:
An explicit construction is given of a minimal free resolution of the ideal generated by all squarefree monomials of a given degree. The construction relies upon and exhibits the natural action of the symmetric group on the syzygy modules. The resolution is obtained over an arbitrary coefficient ring; in particular, it is characteristic free. Two applications are given: an equivariant resolution of De Concini–Procesi rings indexed by hook partitions, and a resolution of FI-modules.