Border bases for lattice ideals

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• 作者：Giandomenico Boffi^a ; ¹ ; ^{giandomenico.boffi@unint.eu" class="auth_mail" title="E-mail the corresponding author} ; Alessandro Logar^b ; ² ; ^{logar@units.it" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Border basis ; Grö ; bner basis ; Lattice ideal ; Maximal clique ; Maximum clique ; Order ideal
• 刊名：Journal of Symbolic Computation
• 出版年：2017
• 出版时间：March-April 2017
• 年：2017
• 卷：79
• 期：part_P1
• 页码：43-56
• 全文大小：435 K

文摘

The main ingredient to construct an source">O$\mathcal{O}$-border basis of an ideal source">I⊆K[x₁,…,x_n]$I\subseteq K[x_1,\dots ,x_n]$ is the order ideal source">O$\mathcal{O}$, which is a basis of the K  -vector space source">K[x₁,…,x_n]/I$K[x_1,\dots ,x_n]/I$. In this paper we give a procedure to find all the possible order ideals associated with a lattice ideal 328" class="mathmlsrc">328.gif&_user=111111111&_pii=S0747717116300840&_rdoc=1&_issn=07477171&md5=446b69f7e3c704fe12ebda2f43557f76" title="Click to view the MathML source">I_M (where M   is a lattice of source">Zⁿ${\mathbb{Z}}^n$). The construction can be applied to ideals of any dimension (not only zero-dimensional) and shows that the possible order ideals are always in a finite number. For lattice ideals of positive dimension we also show that, although a border basis is infinite, it can be defined in finite terms. Furthermore we give an example which proves that not all border bases of a lattice ideal come from Gröbner bases. Finally, we give a complete and explicit description of all the border bases for ideals 328" class="mathmlsrc">328.gif&_user=111111111&_pii=S0747717116300840&_rdoc=1&_issn=07477171&md5=446b69f7e3c704fe12ebda2f43557f76" title="Click to view the MathML source">I_M in case M   is a 2-dimensional lattice contained in source">Z²${\mathbb{Z}}^2$.