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Fritsch, Rudolf (2016): Remarks on orthocenters, Pappus' theorem and Butterfly theorems. In: Journal of Geometry, Vol. 107, No. 2: pp. 305-316

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We present a generalization of the notion of the orthocenter of a triangle and of Pappus' theorem. Both subjects were discussed with Pickert in the last year of his life. Furthermore we add a projective Butterfly theorem which covers all known affine cases.

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