Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2401.14648 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Inhaltsangabe:
- Given a graded bialgebra $H$, we let $Δ^{\left[ k\right] }:H\rightarrow H^{\otimes k}$ and $m^{\left[ k\right] }:H^{\otimes k}\rightarrow H$ be its iterated (co)multiplications for all $k\in\mathbb{N}$. For any $k$-tuple $α=\left( α_{1},α_{2},\ldots,α_{k}\right) \in\mathbb{N}^{k}$ of nonnegative integers, and any permutation $σ$ of $\left\{ 1,2,\ldots,k\right\} $, we consider the map $p_{α,σ}:=m^{\left[ k\right] }\circ P_α\circσ^{-1}\circΔ^{\left[ k\right] }:H\rightarrow H$, where $P_α$ denotes the projection of $H^{\otimes k}$ onto its multigraded component $H_{α_{1}}\otimes H_{α_{2}}\otimes\cdots\otimes H_{α_{k}}$, and where $σ^{-1}:H\rightarrow H$ permutes the tensor factors. We prove formulas for the composition $p_{α,σ}\circ p_{β,τ}$ and the convolution $p_{α,σ}\star p_{β,τ}$ of two such maps. When $H$ is cocommutative, these generalize Patras's 1994 results (which, in turn, generalize Solomon's Mackey formula). We also construct a combinatorial Hopf algebra $\operatorname*{PNSym}$ ("permuted noncommutative symmetric functions") that governs the maps $p_{α,σ}$ for arbitrary connected graded bialgebras $H$ in the same way as the well-known $\operatorname*{NSym}$ governs them in the cocommutative case. We end by outlining an application to checking identities for connected graded Hopf algebras.