Pop-Stack Operators for Torsion Classes and Cambrian Lattices

Emily Barnard, Colin Defant, Eric J. Hanson

The pop-stack operator of a finite lattice $L$ is the map ${\mathrm{pop}}_L^{\downarrow }:L\to L$ that sends each element $x\in L$ to the meet of $\{x\}\cup {\text{cov}}_L(x)$, whe…