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A CHARACTERISATION OF EUCLIDEAN NORMED PLANES VIA BISECTORS

Published online by Cambridge University Press:  20 August 2018

JAVIER CABELLO SÁNCHEZ*
Affiliation:
Departamento de Matemáticas, Universidad de Extremadura, Avda. de Elvas s/n, 06006 Badajoz, Spain email [email protected]
ADRIÁN GORDILLO-MERINO
Affiliation:
Departamento de Matemáticas, Universidad de Extremadura, Avda. de Elvas s/n, 06006 Badajoz, Spain email [email protected]
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Abstract

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Our main result states that whenever we have a non-Euclidean norm $\Vert \cdot \Vert$ on a two-dimensional vector space $X$, there exists some $x\neq 0$ such that for every $\unicode[STIX]{x1D706}\neq 1$, $\unicode[STIX]{x1D706}>0$, there exist $y,z\in X$ satisfying $\Vert y\Vert =\unicode[STIX]{x1D706}\Vert x\Vert$, $z\neq 0$ and $z$ belongs to the bisectors $B(-x,x)$ and $B(-y,y)$. We also give several results about the geometry of the unit sphere of strictly convex planes.

Type
Research Article
Copyright
© 2018 Australian Mathematical Publishing Association Inc. 

Footnotes

The first author was supported in part by DGICYT project MTM2016⋅76958⋅C2⋅1⋅P (Spain) and Junta de Extremadura programs GR⋅15152 and IB⋅16056; the second author was partially supported by Junta de Extremadura and FEDER funds.

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