On the Real-Rootedness of the Descent Polynomials of $(n-2)$-Stack Sortable Permutations

Philip B. Zhang
2015 Electronic Journal of Combinatorics  
Bóna conjectured that the descent polynomials on $(n-2)$-stack sortable permutations have only real zeros. Brändén proved this conjecture by establishing a more general result. In this paper, we give another proof of Brändén's result by using the theory of $s$-Eulerian polynomials recently developed by Savage and Visontai.
doi:10.37236/4613 fatcat:56mt3girancjlljhl7e7inedna