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math.AG2023
Properties of Hesse derivatives of cubic curves
Sayan Dutta, Lorenz Halbeisen, Norbert Hungerbühler
The Hesse curve or Hesse derivative Hess of a cubic curve given by a homogeneous polynomial is the set of points such that , whe…
math.AG2021
Reversion Porisms in Conics
Lorenz Halbeisen, Norbert Hungerbühler, Marco Schiltknecht
We give a projective proof of the butterfly porism for cyclic quadrilaterals and present a general reversion porism for polygons with an arbitrary number of vertices on a conic. We…