On the Twelve-Point Theorem for $\ell$-Reflexive Polygons
On the Twelve-Point Theorem for $\ell$-Reflexive Polygons
It is known that, adding the number of lattice points lying on the boundary of a reflexive polygon and the number of lattice points lying on the boundary of its polar, always yields 12. Generalising appropriately the notion of reflexivity, one shows that this remains true for $\ell$-reflexive polygons. In …