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Ideals with componentwise linear powers

Part of: Algebraic combinatorics Computational aspects and applications General commutative ring theory

Published online by Cambridge University Press:  12 March 2024

Takayuki Hibi  and
Somayeh Moradi
Takayuki Hibi
Affiliation:
Department of Pure and Applied Mathematics, Graduate School of Information Science and Technology, Osaka University, Suita, Osaka 565-0871, Japan e-mail: hibi@math.sci.osaka-u.ac.jp
Somayeh Moradi*
Affiliation:
Department of Mathematics, Faculty of Science, Ilam University, P.O.Box 69315-516, Ilam, Iran
*
e-mail: so.moradi@ilam.ac.ir
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Abstract

Let $S=K[x_1,\ldots ,x_n]$ be the polynomial ring over a field K, and let A be a finitely generated standard graded S-algebra. We show that if the defining ideal of A has a quadratic initial ideal, then all the graded components of A are componentwise linear. Applying this result to the Rees ring $\mathcal {R}(I)$ of a graded ideal I gives a criterion on I to have componentwise linear powers. Moreover, for any given graph G, a construction on G is presented which produces graphs whose cover ideals $I_G$ have componentwise linear powers. This, in particular, implies that for any Cohen–Macaulay Cameron–Walker graph G all powers of $I_G$ have linear resolutions. Moreover, forming a cone on special graphs like unmixed chordal graphs, path graphs, and Cohen–Macaulay bipartite graphs produces cover ideals with componentwise linear powers.

Keywords

Rees algebracover ideal of a graphcomponentwise linear ideal

MSC classification

Primary: 13A02: Graded rings 13P10: Gröbner bases; other bases for ideals and modules (e.g., Janet and border bases)
Secondary: 05E40: Combinatorial aspects of commutative algebra

Information

Type
Article
Information
Canadian Mathematical Bulletin , Volume 67 , Issue 3 , September 2024 , pp. 833 - 841
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Canadian Mathematical Society

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Footnotes

Takayuki Hibi is partially supported by JSPS KAKENHI 19H00637. Somayeh Moradi is supported by the Alexander von Humboldt Foundation.

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