Counting flags of primitive lattices

Tal Horesh, Yakov Karasik

We count flags of primitive lattices, which are objects of the form $0={\Lambda }^{(0)}<{\Lambda }^{(1)}<\cdots <{\Lambda }^{(\ell )}={\mathbb{Z}}^n$, where every ${\Lambda }^{(i)}$ is a primitive lattice in $\mathb…