Existence of special rainbow triangles in weak geometries

Research output: Contribution to journalArticle

Abstract

We show that, in any ordered plane with a symmetric orthogonality relation which allows for a meaningful definition of acute and obtuse angles, in which all points are colored with three colors, such that each color is used at least once, there must exist both an acute triangle whose vertices have all three colors and an obtuse triangle with the same property. We also show that, in both a geometry endowed with an orthogonality relation, in which there is a reflection in every line, in which all right angles are bisectable, which satisfies Bachmann's Lotschnittaxiom (the perpendiculars raised on the sides of a right angle intersect), and in plane absolute geometry, in which all points are colored with three colors, such that each color is used at least once, there exists a right triangle with all vertices of different colors.

Original languageEnglish (US)
JournalGeorgian Mathematical Journal
DOIs
StateAccepted/In press - Jan 1 2019

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Keywords

  • Acute triangle
  • axiom system
  • generalized metric plane
  • Lotschnittaxiom
  • obtuse triangle
  • ordered plane
  • right triangle
  • weak geometries

ASJC Scopus subject areas

  • Mathematics(all)

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