Some Connections Between The Arithmetic and The Geometry of Lipschitz Integers

Abstract

Some relationships between the arithmetic and the geometry of Lipschitz and Hurwitz integers are presented. In particular, it is shown that the (ternary) vector product of a Lipschitz integer $\alpha$ with two other Lipschitz integers, both orthogonal to $\alpha$, is a left and also a right multiple of $\alpha$, and that the vector product of two left multiples of $\alpha$ with any other Lipschitz integer is still a left multiple of $\alpha$. We also provide new arithmetical proofs for some old results of Gordon Pall, and raise a geometric problem on the location of some integral quaternions that is related to the factorization of some integers.