A classification of van der Waerden complexes with linear resolution

Abstract

In 2017, Ehrenborg, Govindaiah, Park, and Readdy defined the van der Waerden complex $\mathtt{vdW}(n,k)$ to be the simplicial complex whose facets correspond to all the arithmetic sequences on the set $\{1,\dots ,n\}$ of a fixed length $k$. To complement a classification of the Cohen--Macaulay van der Waerden complexes obtained by Hooper and Van Tuyl in 2019, a classification of van der Waerden complexes with linear resolution is presented. Furthermore, we show that the Stanley--Reisner ring of a Cohen--Macaulay van der Waerden complex is level.

5 pages; comments welcomed