On weakly separable polynomials and weakly quasi-separable polynomials over rings
Abstract
Separable extensions of noncommutative rings have already been studied extensively. Recently, N. Hamaguchi and A. Nakajima introduced the notions of weakly separable extensions and weakly quasi-separable extensions. They studied weakly separable polynomials and weakly quasi-separable polynomials in the case that the coefficient ring is commutative. The purpose of this paper is to give some improvements and generalizations of Hamaguchi and Nakajima's results. We shall characterize a weakly separable polynomial f(X) over a commutative ring by using its derivative f'(X) and its discriminant δ(f(X)). Further, we shall try to give necessary and sufficient conditions for weakly separable polynomials in skew polynomial rings in the case that the coefficient ring is noncommutative.
Fields of Study & Subjects
Rings
Modules
and Algebras
Algebraic structures and combinatorial models
Commutative Algebra and Its Applications
Publication details
- Journal / source
- arXiv (Cornell University)
- Volume
- 58
- Issue
- 1
- Pages
- 169–182
- Publication date
- 6 March 2026
- Language
- EN
- Document type
- Preprint