English

Restriction and induction of indecomposable modules over the Temperley-Lieb algebras

Mathematical Physics 2017-11-17 v2 math.MP Representation Theory

Abstract

Both the original Temperley-Lieb algebras TLn\mathsf{TL}_{n} and their dilute counterparts dTLn\mathsf{dTL}_{n} form families of filtered algebras: TLnTLn+1\mathsf{TL}_{n}\subset \mathsf{TL}_{n+1} and dTLndTLn+1\mathsf{dTL}_{n}\subset\mathsf{dTL}_{n+1}, for all n0n\geq 0. For each such inclusion, the restriction and induction of every finite-dimensional indecomposable module over TLn\mathsf{TL}_{n} (or dTLn\mathsf{dTL}_{n}) is computed. To accomplish this, a thorough description of each indecomposable is given, including its projective cover and injective hull, some short exact sequences in which it appears, its socle and head, and its extension groups with irreducible modules. These data are also used to prove the completeness of the list of indecomposable modules, up to isomorphism. In fact, two completeness proofs are given, the first is based on elementary homological methods and the second uses Auslander-Reiten theory. The latter proof offers a detailed example of this algebraic tool that may be of independent interest.

Keywords

Cite

@article{arxiv.1605.05159,
  title  = {Restriction and induction of indecomposable modules over the Temperley-Lieb algebras},
  author = {Jonathan Belletête and David Ridout and Yvan Saint-Aubin},
  journal= {arXiv preprint arXiv:1605.05159},
  year   = {2017}
}

Comments

55 pages, 4 figures