L. Williams

collaborators

2 papers

math.CO2025

Polyhedral and Tropical Geometry of Flag Positroids

Jonathan Boretsky, Christopher Eur, Lauren Williams

A flag positroid of ranks $r := (r_{1} < \dots < r_{k})$ on $[n]$ is a flag matroid that can be realized by a real $r_{k} \times n$ matrix $A$ such that the $r_{i} \times r_{i}$ mino…

math.CO2024

Introduction to Cluster Algebras. Chapters 1-3

Sergey Fomin, Lauren Williams, Andrei Zelevinsky

This is a preliminary draft of Chapters 1-3 of our forthcoming textbook "Introduction to Cluster Algebras." This installment contains: Chapter 1. Total positivity Chapter 2. Mutati…