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In this survey article we explain the intricate links between Conway-Coxeter friezes and cluster combinatorics. More precisely, we provide a formula, relying solely on the shape of the frieze, describing how each individual entry in the…

Rings and Algebras · Mathematics 2018-06-19 Karin Baur , Eleonore Faber , Sira Gratz , Khrystyna Serhiyenko , Gordana Todorov

In 2003, Fomin and Zelevinsky obtained Cartan-Killing type classification of all cluster algebras of finite type, i.e. cluster algebras having only finitely many distinct cluster variables. A wider class of cluster algebras is formed by…

Combinatorics · Mathematics 2019-10-25 Anna Felikson , Michael Shapiro , Pavel Tumarkin

Scattering diagrams arose in the context of mirror symmetry, but a special class of scattering diagrams (the cluster scattering diagrams) were recently developed to prove key structural results on cluster algebras. We use the connection to…

Combinatorics · Mathematics 2026-05-21 Nathan Reading

We categorify various finite-type cluster algebras with coefficients using completed orbit categories associated to Frobenius categories. Namely, the Frobenius categories we consider are the categories of finitely generated Gorenstein…

Representation Theory · Mathematics 2017-10-19 Alfredo Nájera Chávez

We count numbers of tame frieze patterns with entries in a finite commutative local ring. For the ring $\mathbb{Z}/p^r\mathbb{Z}$, $p$ a prime and $r\in\mathbb{N}$ we obtain closed formulae for all heights. These may be interpreted as…

Combinatorics · Mathematics 2024-11-07 Bernhard Böhmler , Michael Cuntz

We obtain a multiplication formula for cluster characters on (stably) 2-Calabi-Yau (Frobenius or) triangulated categories. This formula generalizes those known for arbitrary pairs of objects and for Auslander-Reiten triangles. As an…

Representation Theory · Mathematics 2023-01-11 Bernhard Keller , Pierre-Guy Plamondon , Fan Qin

In this paper, we prove Conjecture 4.8 of "Cluster algebras IV" by S. Fomin and A. Zelevinsky, stating that the mutation classes of rectangular matrices associated with cluster algebras of finite type are precisely those classes which are…

Combinatorics · Mathematics 2011-06-30 Ahmet Seven

We show that the class of twisted fractionally Calabi-Yau algebras of finite global dimension coincides with the stable endomorphism algebras of $d$-cluster tilting modules over $d$-representation-finite algebras. This is an application of…

Representation Theory · Mathematics 2026-04-22 Aaron Chan , Osamu Iyama , Rene Marczinzik

In earlier work, the author introduced a method for constructing a Frobenius categorification of a cluster algebra with frozen variables by starting from the data of an internally Calabi-Yau algebra, which becomes the endomorphism algebra…

Representation Theory · Mathematics 2025-02-28 Matthew Pressland

In this article, we introduce the notion of cluster automorphism of a given cluster algebra as a $\ZZ$-automorphism of the cluster algebra that sends a cluster to another and commutes with mutations. We study the group of cluster…

Representation Theory · Mathematics 2014-02-26 Ibrahim Assem , Ralf Schiffler , Vasilisa Shramchenko

This article, based on joint work with Gabriel Carroll, Andy Itsara, Ian Le, Gregg Musiker, Gregory Price, Dylan Thurston, and Rui Viana, presents a combinatorial model based on perfect matchings that explains the symmetries of the…

Combinatorics · Mathematics 2020-05-29 James Propp

We establish certain fundamental properties of $f$-vectors and $F$-matrices for generalized cluster algebras, including the initial and final seed mutation formulas, the compatibility property and the symmetry property. Along the way, we…

Rings and Algebras · Mathematics 2025-06-03 Huihui Ye , Changjian Fu

We introduce a new cluster character with coefficients for a cluster category $\mathcal{C}$ and rather than using a Frobenius $2$-Calabi-Yau realization to incorporate coefficients into the representation-theoretic model for a cluster…

Representation Theory · Mathematics 2021-09-02 Fernando Borges , Tanise Carnieri Pierin

Conway and Coxeter have shown that frieze patterns over positive rational integers are in bijection with triangulations of polygons. An investigation of frieze patterns over other subsets of the complex numbers has recently been initiated…

Number Theory · Mathematics 2023-07-06 Michael Cuntz , Thorsten Holm , Carlo Pagano

It is an important aspect of cluster theory that cluster categories are "categorifications" of cluster algebras. This is expressed formally by the (original) Caldero-Chapoton map X which sends certain objects of cluster categories to…

Representation Theory · Mathematics 2018-12-14 Thorsten Holm , Peter Jorgensen

We describe a new way to relate an acyclic, skew-symmetrizable cluster algebra to the representation theory of a finite dimensional hereditary algebra. This approach is designed to explain the c-vectors of the cluster algebra. We obtain a…

Representation Theory · Mathematics 2012-03-02 David Speyer , Hugh Thomas

We define a generalized version of the frieze variety introduced by Lee, Li, Mills, Seceleanu and the second author. The generalized frieze variety is an algebraic variety determined by an acyclic quiver and a generic specialization of…

Representation Theory · Mathematics 2019-07-09 Kiyoshi Igusa , Ralf Schiffler

This if the final paper in the seriesContinuous Quivers of Type $A$. In this part, we generalize existing geometric models of type $A$ cluster structures to the new $\mathbf E$-clusters introduced in part (III). We also introduce an…

Representation Theory · Mathematics 2025-06-19 Job Rock

A classic result of Conway and Coxeter on frieze patterns has been generalized to a bijection between $p$-angulations of regular polygons and frieze patterns of type $\Lambda_p$. One of the features of Conway-Coxeter theory is a…

Combinatorics · Mathematics 2026-03-20 Michael Cuntz , Thorsten Holm , Peter Jorgensen

We consider nonlinear recurrences generated from the iteration of maps that arise from cluster algebras. More precisely, starting from a skew-symmetric integer matrix, or its corresponding quiver, one can define a set of mutation…

Exactly Solvable and Integrable Systems · Physics 2011-09-23 Allan P. Fordy , Andrew Hone