2 problems

Let $\Phi$ be a root system, let $\mathcal{M}(\Phi)$ be its diagonal coinvariant ring, and define its bigraded Hilbert series by … Let $\mathcal{I}(\Phi^+)$ denote the order ideals…

Let $\Phi$ be a noncrystallographic root system of rank $n$. Define the antichain generating function … Let $N\!C(\Phi)$ be the noncrossing partition lattice and let … be its Möbiu…