Abstract

Bergeron and Li have introduced a set of axioms which guarantee that the Grothendieck groups of a tower of algebras $\bigoplus_{n \geq 0}A_n$ can be endowed with the structure of graded dual Hopf algebras. Hivert and Nzeutzhap, and independently Lam and Shimozono constructed dual graded graphs from primitive elements in Hopf algebras. In this paper we apply the composition of these constructions to towers of algebras. We show that if a tower $\bigoplus_{n \geq 0}A_n$ gives rise to graded dual Hopf algebras then we must have $\dim (A_n)=r^nn!$ where $r = \dim (A_1)$. Bergeron et Li ont donné un ensemble d'axiomes qui garanti que les groupes de Grothendieck d'une tour d'algèbres $\bigoplus_{n \geq 0}A_n$ peuvent être dotés d'une structure d'algèbres de Hopf graduées duales. Hivert et Nzeutzhap, et indépen\-damment Lam et Shimozono, ont construit des graphes gradués duals à partir d'éléments primitifs dans des algèbres de Hopf. Dans cet article, nous appliquons la composition de ces constructions aux tours des algèbres. Nous prouvons que si une tour $\bigoplus_{n \geq 0}A_n$ donne des algèbres de Hopf graduées duales, alors nous devons avoir $\dim (A_n)=r^nn!$ où $r = \dim (A_1)$.

Highlights

  • This paper is concerned with the interplay between towers of associative algebras, pairs of dual combinatorial Hopf algebras, and dual graded graphs

  • Our point of departure is the study of the composition of two constructions: (i) the construction of dual Hopf algebras from towers of algebras satisfying some axioms, due to Bergeron and Li (BL); and (ii) the construction of dual graded graphs from primitive elements in dual Hopf algebras, discovered independently by Hivert and Nzeutchap (HN), and Lam and Shimozono: tower of algebras −→ combinatorial Hopf algebra −→ dual graded graph

  • To classify all combinatorial Hopf algebras which arise as Grothendieck groups associated with a tower of algebras n≥0 An

Read more

Summary

Introduction

This paper is concerned with the interplay between towers of associative algebras, pairs of dual combinatorial Hopf algebras, and dual graded graphs. The second arrow is obtained by using (some of the) structure constants of a combinatorial Hopf algebra as edge multiplicities for a graph Y. Thibon, to classify all combinatorial Hopf algebras which arise as Grothendieck groups associated with a tower of algebras n≥0 An. The list of axioms given by the first and last author in (BL) guarantees that the Grothendieck groups of a tower of algebras form a pair of graded dual Hopf algebras. Theorem 1.1 If A = n≥0 An is a tower of algebras such that its associated Grothendieck groups form a pair of graded dual Hopf algebras, dim(An) = rnn! The general construction of (LS) produces dual graded graphs from Bruhat orders of Weyl groups of Kac-Moody algebras and it is unclear whether there are Hopf algebras, or towers of algebras giving rise to these graphs

From towers of algebras to combinatorial Hopf algebras
From combinatorial Hopf algebras to dual graded graphs
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call