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arxiv: 1510.01657 · v1 · pith:B6H6QDSPnew · submitted 2015-10-06 · 🧮 math.CO · math.RT

A new generalization of Hermite's reciprocity law

classification 🧮 math.CO math.RT
keywords mathbblambdaleftrightfunctorhermitereciprocityschur
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Given a partition $\lambda$ of $n$, the {\it Schur functor} $\mathbb{S}_\lambda$ associates to any complex vector space $V$, a subspace $\mathbb{S}_\lambda(V)$ of $V^{\otimes n}$. Hermite's reciprocity law, in terms of the Schur functor, states that $ \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 $\mathbb{S}_{\lambda}\left(\mathbb{S}_{\delta}(\mathbb{C}^2)\right)\simeq \mathbb{S}_{\mu}\left(\mathbb{S}_{\epsilon}(\mathbb{C}^2)\right)$.

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