Refined Coxeter polynomials

TL;DR

This paper introduces refined Coxeter polynomials, a new tool for computing Coxeter polynomials of finite-dimensional algebras, revealing symmetries and constructing new algebraic structures.

Contribution

It defines refined Coxeter polynomials via poset insertions into triangular algebras and explores their properties and applications.

Findings

Refined Coxeter polynomials control Coxeter polynomial computations.

New symmetry properties for Coxeter polynomials of ordinal sums of posets.

Construction methods for algebras of cyclotomic type and interlaced towers.

Abstract

Coxeter polynomials are important homological invariants that are defined for a large class of finite-dimensional algebras. It is of particular interest to develop methods to compute these polynomials. We define the notion of insertion of a poset into a triangular algebra at a vertex of its quiver and show that its Coxeter polynomial is controlled in a uniform way by two polynomials attached to the poset that we call refined Coxeter polynomials. Several properties of these polynomials are discussed. Applications include new symmetry properties for Coxeter polynomials of ordinal sums of posets, constructions of new algebras of cyclotomic type and interlaced towers of algebras.