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Perfect Non-Extremal Riemann Surfaces

Published online by Cambridge University Press:  20 November 2018

Paul Schmutz Schaller
Paul Schmutz Schaller*
Affiliation:
Université de Neuchâtel Institut de mathématiques Rue Emile-Argand 11 CH-2007 Neuchâtel Switzerland, Paul.Schmutz@maths.unine.ch
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Abstract

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An infinite family of perfect, non-extremal Riemann surfaces is constructed, the first examples of this type of surfaces. The examples are based on normal subgroups of the modular group $\text{PSL}\left( 2,\,\mathbb{Z} \right)$ of level 6. They provide non-Euclidean analogues to the existence of perfect, non-extremal positive definite quadratic forms. The analogy uses the function syst which associates to every Riemann surface $M$ the length of a systole, which is a shortest closed geodesic of $M$.

Keywords

11H9911F0630F45
Type
Research Article
Information
Canadian Mathematical Bulletin , Volume 43 , Issue 1 , 01 March 2000 , pp. 115 - 125
Copyright
Copyright © Canadian Mathematical Society 2000

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