Gröbner bases with respect to several term orderings and multivariate dimension polynomials

Gröbner bases with respect to several term orderings and multivariate dimension polynomials
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关于多个项排序和多元维多项式的 Gröbner 基

DOI:
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发表时间:
2007
期刊:
International Symposium on Symbolic and Algebraic Computation
影响因子:
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通讯作者:
A. Levin
A. Levin
中科院分区:
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文献类型:
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作者:
A. Levin

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设D是域K上m个变量为x1,…,xm的Ore多项式环,集合{x1,…,xm}到p个不相交的子集的划分是固定的,使得D可以被视为具有与该划分相关的自然p维变换的滤子环.我们在有限生成的自由D-模中引入了一种特殊类型的约简,并发展了相应的Gröbner基技巧,使得人们可以证明与有限生成的D-模相关的p个变量的维多项式的存在性和不变量.我们还给出了这种多项式的一种计算方法,并得到了关于微分域扩张的维度多项式的Kolchin定理的一个本质推广。
Let D be a ring of Ore polynomials in m variables x 1 ,...,x m over a field K and let a partition of the set {x 1 ,...,x m}into p disjoint subsets be fixed, so that D can be treated as a filtered ring with the natural p-dimensional ltration associated with the partition.We introduce a special type of reduction in a finitely generated free D-module and develop the corresponding Gröbner basis technique that allows one to prove the existence and find invariants of a dimension polynomial in p variables associated with a finitely generated D-module. We also outline a method of computation of such a polynomial and obtain an essential generalization of the Kolchin theorem on the dimension polynomial of a differential field extension.