New Wilson-like theorems arising from Dickson polynomials

Abstract: Wilson's Theorem states that the product of all nonzero elements of a finite field ${\mathbb F}_q$ is $-1$. In this article, we define some natural subsets $S \subset {\mathbb F}_q<sup>\times$ and find formulas for the product of the elements of $S$, denoted $\prod S$. These new formulas are appealing for the simple, natural description of the sets $S$, and for the simplicity of the product. An example is $\prod\left{ a \in {\mathbb F}_q^\times : \text{$1-a$and$3+a$ are nonsquares} \right} = 2$ if $q \equiv \pm 1 \pmod{12}$, or $-1$ otherwise.