Erik Leffler

collaborators

2 papers

math.AC2026

Describing Multivariate Polynomial Subalgebras Using Equations

Erik Leffler

Let $K$ be an algebraically closed field, and $A \subset K [x_{1}, \dots, x_{n}]$ be a subalgebra of finite codimension. It is known that there exists a (not necess…

math.RA2021

Describing subalgebras of $K [x]$ using derivatives

Rode Grönkvist, Erik Leffler, Anna Torstensson +1

We introduce the concept of subalgebra spectrum, $S p (A)$ , for a subalgebra $A$ of finite codimension in $K [x]$ . The spectrum is a subset of the underlying field. We also i…

Describing Multivariate Polynomial Subalgebras Using Equations

Describing subalgebras of K[x] using derivatives

Describing subalgebras of $K [x]$ using derivatives