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HALBEISEN, Lorenz; HUNGERBÜHLER, Norbert; SCHİLTKNECHT, Marco
International Electronic Journal of Geometry, 10/2021, Letnik: 14, Številka: 2Journal Article
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 also investigate projective properties of the porisms.
