Year: 2025
Type: preprint
Abstract: Let $R$ be a ring and $B := R[X_1, \dots, X_n]$ the polynomial ring in $n$ variables over $R$. In this article, we consider retractions $φ: B \longrightarrow B$ such that $φ(X_i)$ is $0$, or a monomial or the sum of two monomials. We prove that, under certain conditions on the base ring $R$, the resulting retracts are also polynomial rings over $R$. We characterize different monomial retractions of $B$, i.e., where $φ(X_i)$ is $0$ or a monomial for all $i$, giving the same retract. We also generalize the structure of monomial retracts by allowing a few variables to map to arbitrary polynomials, but only under some additional restrictions on the base ring $R$.
Source: arXiv (Cornell University)
Authors: Chakraborty, Sagnik, Pal, Madhuparna
Language: English
Topic: Rings, Modules, and Algebras
Subfield: Algebra and Number Theory
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6979285488
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