Hecke modules associated to certain even ternary lattices of half-discriminant ${\mathbf{N}}^2$

Samadrito Bhattacharyya, Giovanna De Lauri, Dan Fretwell

We consider Hecke modules of orthogonal modular forms attached to definite even ternary lattices of half-discriminant $N^2$, where $N>1$ is odd and square-free. We prove explicit…