On the Schur positivity of ${\Delta }_{e_2}{e}_n[X]$

Dun Qiu, Jeffrey B. Remmel, Emily Sergel +1

Let $\mathbb{N}$ denote the set of non-negative integers. Haglund, Wilson, and the second author have conjectured that the coefficient of any Schur function $s_{\lambda }[X]$ in $Δ_{e_k} e_…