Apostolos Hadjidimos,
Twins of Hofstadter elements,
Forum Geometricorum, 18 (2018) 63--70.

Abstract. In this article the Hofstadter triangles, transversals, points and sectrices are considered and, based on these known elements, new ones closely related to Hofstadter's elements called "twins" are defined, analyzed and studied.

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