2023/09/24 by Vassilis Dionyssis Moustakas, Moustakas, Vassilis Dionyssis
Mathematics · Social Sciences · #05A05 #05A15 #05E10 #Advanced Combinatorial Mathematics #Combinatorics (math.CO) #FOS: Mathematics #Global Maritime and Colonial Histories #Islamic Studies and History #Primary 05E05 #Secondary 20C30
paper · pdf · doi:10.48550/arxiv.2309.13615
openalex publication_date 2023/09/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The quasisymmetric generating function of the set of permutations whose inverses have a fixed descent set is known to be symmetric and Schur-positive. The corresponding representation of the symmetric group is called the descent representation. In this paper, we provide an extension of this result to colored permutation groups, where Gessel's fundamental quasisymmetric functions are replaced by Poirier's colored quasisymmetric functions. For this purpose, we introduce a colored analogue of zigzag shapes and prove that the representations associated with these shapes coincide with colored descent representations studied by Adin, Brenti and Roichman in the case of two colors and Bagno and Biagioli in the general case. Additionally, we provide a colored analogue of MaMahon's alternating formula which expresses ribbon Schur functions in the basis of complete homogeneous symmetric functions.