Set partitions, fermions, and skein relations

TL;DR

This paper establishes a connection between fermionic diagonal coinvariant rings and skein relations on set partitions, providing an $rak{S}_n$-equivariant crossing resolution method using exterior algebra techniques.

Contribution

It introduces a novel isomorphism linking a submodule of the fermionic diagonal coinvariant ring to a skein representation of set partitions, extending the crossing resolution theory.

Findings

Identifies a natural connection between exterior algebra and skein relations.

Provides an $rak{S}_n$-equivariant crossing resolution method.

Establishes an isomorphism between fermionic coinvariant submodules and skein representations.

Abstract

Let $\Theta_n = (\theta_1, \dots, \theta_n)$ and $\Xi_n = (\xi_1, \dots, \xi_n)$ be two lists of $n$ variables and consider the diagonal action of $\mathfrak{S}_n$ on the exterior algebra $\wedge \{ \Theta_n, \Xi_n \}$ generated by these variables. Jongwon Kim and the second author defined and studied the fermionic diagonal coinvariant ring $FDR_n$ obtained from $\wedge \{ \Theta_n, \Xi_n \}$ by modding out by the $\mathfrak{S}_n$-invariants with vanishing constant term. On the other hand, the second author described an action of $\mathfrak{S}_n$ on the vector space with basis given by noncrossing set partitions of $\{1,\dots,n\}$ using a novel family of skein relations which resolve crossings in set partitions. We give an isomorphism between a natural Catalan-dimensional submodule of $FDR_n$ and the skein representation. To do this, we show that set partition skein relations arise naturally in the context of exterior algebras. Our approach yields an $\mathfrak{S}_n$-equivariant way to resolve crossings in set partitions. We use fermions to clarify, sharpen, and extend the theory of set partition crossing resolution.