Quadratic Packing Polynomials on Sectors of $\mathbb{R}^2$
A polynomial $p(x,y)$ on a region $S$ in the plane is called a packing polynomial if the restriction of $p(x,y)$ to $S\cap \mathbb{Z}^2$ yields a bijection to $\mathbb{N}$. In this paper, we determine all quadratic packing polynomials on rational sectors of $\mathbb{R}^2$.
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