Canonical Lattices of Integer Relations Associated to Rational Fans: Wall Generation and a Two-Step Support Filtration

Rizwan Jahangir, Daisuke Ishii

We study the lattice $L_{\mathrm{rel}}(\Sigma )=\ker ({\mathbb{Z}}^{\Sigma (1)}\to N)$ of integer relations among the primitive ray generators of a rational fan $\Sigma$, from an intrinsic, co…