SL_2-tilings and triangulations of the strip

TL;DR

This paper introduces a new class of SL_2-tilings, establishing a bijection with triangulations of the strip, thereby expanding the understanding of their combinatorial and algebraic properties.

Contribution

It constructs a broad new class of SL_2-tilings and demonstrates a bijection with triangulations of the strip, linking algebraic matrices to combinatorial structures.

Findings

New class of SL_2-tilings constructed

Bijection established between tilings and strip triangulations

Expanded understanding of algebraic-combinatorial correspondence

Abstract

SL_2-tilings were introduced by Assem, Reutenauer, and Smith in connection with frieses and their applications to cluster algebras. An SL_2-tiling is a bi-infinite matrix of positive integers such that each adjacent 2 x 2-submatrix has determinant 1. We construct a large class of new SL_2-tilings which contains the previously known ones. More precisely, we show that there is a bijection between our class of SL_2-tilings and certain combinatorial objects, namely triangulations of the strip.