Study on cluster algebras via abstract pattern and two conjectures on d-vectors and g-vector

TL;DR

This paper introduces an abstract framework called GLP algebras to unify various cluster algebra types, proving key properties like linear independence of cluster monomials and verifying conjectures on g-vectors and d-vectors.

Contribution

It develops a generalized Laurent phenomenon algebra framework, proving positivity and linear independence results, and confirms conjectures on g-vectors and d-vectors for specific cluster algebra classes.

Findings

Positive GLP algebras have the proper Laurent monomial property.

Skew-symmetric cluster algebras are d-vector-positive.

G-vectors form a Z-basis and distinguish cluster monomials in certain classes.

Abstract

We mainly introduce an abstract pattern to study cluster algebras. Cluster algebras, generalized cluster algebras and Laurent phenomenon algebras are unified in the language of generalized Laurent phenomenon algebras (briefly, GLP algebras) from the perspective of Laurent phenomenon. In this general framework, we firstly prove that each positive and d-vector-positive GLP algebra has the proper Laurent monomial property and thus its cluster monomials are linearly independent. Skew-symmetric cluster algebras are verified to be d-vector-positive, which gives the affirmation of Conjecture [conjd] in [FZ3] in this case. And since the positivity of skew-symmetric cluster algebras is well-known, the new proof is obtained for the linearly independence of cluster monomials of skew-symmetric cluster algebras. For a class of GLP algebras which are pointed, g-vectors of cluster monomials are defined. We verify that for any positive GLP algebra pointed at $t_0$, the g-vectors ${\bf g}_{1;t}^{t_0},\cdots, {\bf g}_{n;t}^{t_0}$ form a $\mathbb Z$-basis of $\mathbb Z^n$, and different cluster monomials have different g-vectors. As a direct application, we verify that Conjecture [conjg] in [FZ3] holds for skew-symmetrizable cluster algebras and acyclic sign-skew-symmetric cluster algebras.