A class of polyocollection ideals with quadratic Gröbner bases

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Original abstract

In 2024, Cisto et al. introduced polyocollections and polyocollection ideals, which generalize the notions of collections of cells and inner $2$-minors ideals, respectively. In this paper, we naturally extend the notions and results about zig-zag walk, zero-sum condition, rook number, and switching polynomial from collections of cells to polyocollections, and we define a class of polyocollections, called natural polyocollections, whose structure is similar to that of collections of cells. We focus on natural polyocollections whose polyocollection ideals admit quadratic Gröbner bases with respect to lexicographic order induced by some specific orders on vertices. Using the zero-sum condition, we prove the primality of this class of polyocollections, which shows that the zig-zag conjecture proposed by Mascia et al. holds true for collections of cells satisfying the aforementioned properties. Moreover, we show that $h$-polynomials and regularities of the coordinate rings of this class of polyocollections are equal to their switching rook polynomials and rook numbers, respectively. These results give positive answers to the switching rook polynomial conjecture proposed by Jahangir and Navarra, and the rook number open problem proposed by Rinaldo and Romeo for collections of cells satisfying the aforementioned properties.

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• Official / arXiv page
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