On the Σ classes in E6

In E6, the cone of positive definite quadratic forms is subdivided into Σ s subcones and its equivalence classes {\cal E}_{\Sigma _s} are determined for s = 0 – 3, and 18 – 21.

Source: Acta Crystallographica Section A - August 24, 2020 Category: Chemistry Authors: Engel, P. Tags: translation lattices parallelohedra cone of positive quadratic forms Sigma classes research papers Source Type: research