DescriptionRoot phi rectangle.svg English: A root-phi rectangle, shown with division into a pair of Kepler triangles, the only right triangles with edge...
{\displaystyle H_{\alpha }+n/2\alpha } for α ∈ Φ {\displaystyle \alpha \in \Phi } a root, H α {\displaystyle H_{\alpha }} the hyperplane perpendicular to α {\displaystyle...
