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Institut de Mathématiques de Marseille, UMR 7373
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Compact non-orientable surfaces of genus 6 with extremal metric discs

11h00 - 12h00
horaire FRUMAM

Aix-Marseille Université - Site St Charles
3, place Victor Hugo - case 39
13331 MARSEILLE Cedex 03

A compact hyperbolic surface of genus g is said to be extremal if it admits an extremal disc, a disc of the largest radius determined by g, where genus g is the number of handles if S is orientable or the number of cross caps if S is non-orientable. In this talk we shall consider how many extremal discs are embedded in a compact non-orientable surface of genus 6. We know the answer for the surfaces of g=3, 4, 5 and also g>6, so that g=6 is the final genus in our interest. By showing side-pairing patterns of the regular 30-gon, we present all non-orientable extremal surfaces of genus 6 admitting more than one extremal disc. We also determine the group of automorphisms for these surfaces.