Reading's" shard intersection order" on the symmetric group can be realized as the" lattice of
wide subcategories" of the corresponding preprojective algebra. In this paper, we first use …

We study maximal almost rigid modules over a gentle algebra $ A $. We prove that the
number of indecomposable direct summands of every maximal almost rigid $ A $-module is …

We show that isomorphism classes of indecomposable-rigid pairs over, the preprojective
algebra of, are in bijection with internal-simplices in the prism, the product of an-simplex with …

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