Gauge-reversing maps on cones, and Hilbert and Thompson isometries

Cormac Walsh 1, 2, 3
1 MAXPLUS - Max-plus algebras and mathematics of decision
CMAP - Centre de Mathématiques Appliquées - Ecole Polytechnique, Inria Saclay - Ile de France
3 TROPICAL - TROPICAL
Inria Saclay - Ile de France
Abstract : We show that a cone admits a gauge-reversing map if and only if it is a symmetric cone. We use this to prove that every isometry of a Hilbert geometry is a collineation unless the Hilbert geometry is the projective space of a non-Lorentzian symmetric cone, in which case the collineation group is of index two in the isometry group. We also determine the isometry group of the Thompson geometry on a cone.
Type de document :
Article dans une revue
Geometry and Topology, Mathematical Sciences Publishers, 2018, 22 (1), pp.55-104
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https://hal.inria.fr/hal-00930929
Contributeur : Cormac Walsh <>
Soumis le : mardi 14 janvier 2014 - 16:43:10
Dernière modification le : dimanche 6 janvier 2019 - 01:09:52

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  • HAL Id : hal-00930929, version 1
  • ARXIV : 1312.7871

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Cormac Walsh. Gauge-reversing maps on cones, and Hilbert and Thompson isometries. Geometry and Topology, Mathematical Sciences Publishers, 2018, 22 (1), pp.55-104. 〈hal-00930929〉

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