Extended Abstract: Canonical join complex and cubical coordinates for all framing lattices

TL;DR

This work introduces a combinatorial model for framing lattices, generalizing classical structures like Tamari lattices, and defines cubical coordinates to facilitate efficient comparisons.

Contribution

It generalizes noncrossing arc diagrams and bracket vectors to all framing lattices, providing explicit bijections and a new coordinate system.

Findings

Defined bricks and brick cliques as models for join-irreducible elements

Established a bijective reconstruction algorithm for the model

Introduced cubical coordinates for efficient lattice comparison

Abstract

This document is an extended abstract for two articles in preparation. Recently, framing lattices were introduced to generalize many classical lattices such as the Tamari lattice and the weak order on the symmetric group. We define bricks and brick cliques as a combinatorial model for join-irreducible elements and canonical join representations in all framing lattices, generalizing noncrossing arc diagrams of (Reading, 2015) for the weak order on the symmetric group. Our model captures the natural bijection between join and meet canonical representations, as well as duality upon reflections of the framed graph. The proof is bijective, with an explicit reconstruction algorithm in two steps. A useful intermediate construction in our bijective proof is our new definition of cornered cliques. These enable us to define cubical coordinates on a framing lattice, generalizing bracket vectors for the Tamari lattice and providing an efficient comparison criterion.