Canonical Bases for Subalgebras on two Generators in the Univariate Polynomial Ring

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Abstract

Abstract. In this paper we examine subalgebras on two generators in the univariate polynomial ring. A set, S, of polynomials in a subalgebra of a polynomial ring is called a canonical basis (also referred to as SAGBI basis) for the subalgebra if all lead monomials in the subalgebra are products of lead monomials of polynomials in S. In this paper we prove that a pair of polynomials ff; gg is a canonical basis for the
subalgebra they generate if and only if both f and g can be written as compositions of polynomials with the same inner polynomial h for some h of degree equal to the greatest common divisor of the degrees of f and g. Especially polynomials of relatively prime degrees constitute a canonical basis. Another special case occurs when the degree of g is a multiple of the degree of f. In this case ff; gg is a canonical basis if
and only if g is a polynomial in f.
Original languageEnglish
Pages (from-to)565-577
JournalBeiträge zur Algebra und Geometrie
Volume43
Issue number2
Publication statusPublished - 2002

Subject classification (UKÄ)

  • Mathematics

Keywords

  • canonical bases
  • subalgebra
  • univariate polynomial ring

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