Abstract
In this paper we continue the study of good re-embeddings of affine K-algebras started in Kreuzer et al. (J Algebra Appl, 2021. https://doi.org/10.1142/S0219498822501882). The idea is to use special linear projections to find isomorphisms between a given affine K-algebra K[X]/I, where \(X=(x_1,\dots ,x_n)\), and K-algebras having fewer generators. These projections are induced by particular tuples of indeterminates Z and by term orderings \(\sigma \) which realize Z as leading terms of a tuple F of polynomials in I. In order to efficiently find such tuples, we provide two major new tools: an algorithm which reduces the check whether a given tuple F is Z-separating to an LP feasibility problem, and an isomorphism between the part of the Gröbner fan of I consisting of marked reduced Gröbner bases which contain a Z-separating tuple and the Gröbner fan of \(I\cap K[X\setminus Z]\). We also indicate a possible generalization to tuples Z which consist of terms. All results are illustrated by explicit examples.
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The second author is partially supported by the Hue University under grant number DHH2021-03-159.
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Communicated by Isidoro Gitler.
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Kreuzer, M., Long, L.N. & Robbiano, L. Restricted Gröbner fans and re-embeddings of affine algebras. São Paulo J. Math. Sci. 17, 242–267 (2023). https://doi.org/10.1007/s40863-022-00324-w
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DOI: https://doi.org/10.1007/s40863-022-00324-w