Hesse's theorem
From HandWiki
In geometry, Hesse's theorem, named for Otto Hesse, states that if two pairs of opposite vertices of a quadrilateral are conjugate with respect to some conic, then so is the third pair. A quadrilateral with this property is called a Hesse quadrilateral.
References
- Dolgachev, Igor V. (2012), Classical Algebraic Geometry: a modern view, Cambridge University Press, ISBN 978-1-107-01765-8, http://www.math.lsa.umich.edu/~idolga/CAG.pdf, retrieved 2012-04-29
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