English

A new generalization of Hermite's reciprocity law

Combinatorics 2015-10-07 v1 Representation Theory

Abstract

Given a partition λ\lambda of nn, the {\it Schur functor} Sλ\mathbb{S}_\lambda associates to any complex vector space VV, a subspace Sλ(V)\mathbb{S}_\lambda(V) of VnV^{\otimes n}. Hermite's reciprocity law, in terms of the Schur functor, states that S(p)(S(q)(C2))S(q)(S(p)(C2)). \mathbb{S}_{(p)}\left(\mathbb{S}_{(q)}(\mathbb{C}^2)\right)\simeq \mathbb{S}_{(q)}\left(\mathbb{S}_{(p)}(\mathbb{C}^2)\right). We extend this identity to many other identities of the type Sλ(Sδ(C2))Sμ(Sϵ(C2))\mathbb{S}_{\lambda}\left(\mathbb{S}_{\delta}(\mathbb{C}^2)\right)\simeq \mathbb{S}_{\mu}\left(\mathbb{S}_{\epsilon}(\mathbb{C}^2)\right).

Keywords

Cite

@article{arxiv.1510.01657,
  title  = {A new generalization of Hermite's reciprocity law},
  author = {Leandro Cagliero and Daniel Penazzi},
  journal= {arXiv preprint arXiv:1510.01657},
  year   = {2015}
}

Comments

Accepted in Journal of Algebraic Combinatorics