Beitr\ EMIS ELibM Electronic Journals Beiträge zur Algebra und Geometrie
Contributions to Algebra and Geometry
Vol. 45, No. 2, pp. 517-525 (2004)

Previous Article

Next Article

Contents of this Issue

Other Issues

ELibM Journals

ELibM Home



Large equilateral triangles inscribed in the unit disk of a Minkowski plane

Ewa Fabinska and Marek Lassak

Instytut Matematyki i Fizyki ATR, Kaliskiego 7, 85-796 Bydgoszcz, Poland, e-mail:, e-mail:

Abstract: We consider a generalization of the problem of finding large equilateral triangles in the unit disks of a normed plane; we accept asymmetric unit disks, i.e. we deal with Minkowski planes. We prove that the unit disk of an arbitrary Minkowski plane permits an inscribed equilateral triangle whose oriented side lengths are at least $1.25$. We conjecture that this estimate can be improved up to $1.5$. An example shows that a better value is impossible.

Classification (MSC2000): 52A10, 52A21

Full text of the article:

Electronic version published on: 9 Sep 2004. This page was last modified: 4 May 2006.

© 2004 Heldermann Verlag
© 2004--2006 ELibM and FIZ Karlsruhe / Zentralblatt MATH for the EMIS Electronic Edition