2 problems

Let $M(A)$ be a non-pure t-motive defined by (1.7), where $A$ is of the form (1.8), and consider the lattice map from this set of t-motives to the set of lattices of rank $3$ in…

Let $M(A)$ be a non-pure t-motive defined by (1.7), with $A$ of the form (1.8), and let the lattice map send $M(A)$ to its lattice. The set of such $M(A)$ has dimension $3$ over…