Generalised Delta square conjecture, rise version

Let m,n,km,n,k be nonnegative integers, let hmh_m and eje_j be the complete homogeneous and elementary symmetric functions, and let Δf\Delta_f be the Delta operator. Let ω\omega be the standard involution on symmetric functions, pnp_n the power-sum symmetric function, and LSQ(m,n)k\mathsf{LSQ}(m,n)^{\ast k} the set of labelled rise-decorated square paths of size m+nm+n with mm zero labels and kk decorations. For π\pi in this set, write dinv(π)\mathsf{dinv}(\pi), area(π)\mathsf{area}(\pi), and xπx^\pi for its associated statistics and monomial weight.

Generalised Delta square conjecture, rise version.

[nk]t[n]tΔhmΔenkω(pn)=πLSQ(m,n)kqdinv(π)tarea(π)xπ.\frac{[n-k]_t}{[n]_t} \Delta_{h_m} \Delta_{e_{n-k}} \omega(p_n) = \sum_{\pi \in \mathsf{LSQ}(m,n)^{\ast k}} q^{\mathsf{dinv}(\pi)} t^{\mathsf{area}(\pi)} x^\pi.

The rise version for m=0m=0 is the previously known square conjecture, proved by Sergel using the shuffle theorem. The generalised statement is attributed in the source to D'Adderio, Iraci, and Vanden Wyngaerd and remains open.

Sources & referencesView supporting material

Primary source

Alessandro Iraci and Anna Vanden Wyngaerd, “A valley version of the Delta square conjecture”, arXiv:2003.12048 (2020).

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