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Harmonic differential forms for pseudo-reflection groups ...
Joshua P. Swanson, Nolan R. Wallach · 2021-09-08 · via math.CO updates on arXiv.org

This paper studies three results that describe the structure of the super-coinvariant algebra of pseudo-reflection groups over a field of characteristic $0$. Our most general result determines the top component in total degree, which we prove for all Shephard--Todd groups $G(m, p, n)$ with $m \neq p$ or $m=1$. Our strongest result gives tight bi-degree bounds and is proven for all $G(m, 1, n)$, which includes the Weyl groups of types $A$ and $B$/$C$. For symmetric groups (i.e. type $A$), this provides new evidence for a recent conjecture of Zabrocki related to the Delta Conjecture of Haglund--Remmel--Wilson. Finally, we examine analogues of a classic theorem of Steinberg and the Operator Theorem of Haiman. Our arguments build on the type-independent classification of semi-invariant harmonic differential forms carried out in the first part of this series. In this paper we use concrete constructions including Gröbner and Artin bases for the classical coinvariant algebras of the pseudo-reflection groups $G(m, p, n)$, which we describe in detail. We also prove that exterior differentiation is exact on the super-coinvariant algebra of a general pseudo-reflection group. Finally, we discuss related conjectures and enumerative consequences.