Classification of rational angles in plane lattices II

Abstract

This paper is a continuation of an earlier one, and completes a classification of the configurations of points in a plane lattice that determine angles that are rational multiples of $\pi$. We give a complete and explicit description of lattices according to which of these configurations can be found among their points.

39 pages. Second part of Classification of rational angles in plane lattices (https://doi.org/10.1090/bull/1723)