The isotropic lines of Z_{d}^{2}
arXiv:0809.3220 · doi:10.1088/1751-8113/42/7/072001
Abstract
We show that the isotropic lines in the lattice Z_{d}^{2} are the Lagrangian submodules of that lattice and we give their number together with the number of them through a given point of the lattice. The set of isotropic lines decompose into orbits under the action of SL(2,Z_d). We give an explicit description of those orbits as well as their number and their respective cardinalities. We also develop two group actions on the group Σ_{D}(M) related to the topic.
10 pages