2 problems

Let $W$ be a Weyl group, let $w\in W$, and let $\mathcal{F}(w)$ be its torsion-free class. A brick is an object with division endomorphism ring. Brick occurrence characterization.…

Let $W$ be a Weyl group, let $w\in W$, and let $B_1,\dots,B_l$ be a brick sequence of the torsion-free class $\mathcal{F}(w)$. Suppose that … for $1\leq i<m<j\leq l$. Brick-sequenc…