A family of 4-dimensional lattices $L_k \subset \mathbb{R}^2$ is defined. Each lattice is defined by 2 quadratic extensions and has a \emph{finite} number of unit vectors, but the number of unit vectors in the family is \emph{unbounded}. $L_3$ is the Moser lattice.

翻译：定义了一族四维格 $L_k \subset \mathbb{R}^2$。每个格由两个二次扩张定义，并具有有限数量的单位向量，但该族格中单位向量的数量是无限的。$L_3$ 是 Moser 格。