A group theoretic interpretation of Poncelet's theorem with the complex case - Albrecht Hess Poncelet's theorem about polygons that are inscribed...
A group theoretic interpretation of Poncelet's theorem - Albrecht Hess, Daniel Perrin, and Mehdi Trense Poncelet's theorem about polygons that...
Transforming tripolar into barycentric coordinates - Albrecht Hess A simple construction is presented to find a point with given tripolar...
On a circle containing the incenters of tangential quadrilaterals - Albrecht Hess When we fix one side and draw different tangential...
Bicentric quadrilaterals through inversion - Albrecht Hess We show that inversion is a delightful tool for making some recent and some older...
A highway from Heron to Brahmagupta - Albrecht Hess We give a simple derivation of Brahmagupta's area formula for a cyclic quadrilateral from...
