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The trapezoid comparison inequality in metric spaces with curvature bounded above

Schötz, Christof
arXiv (OAI Expanded) · Papers
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metric-geometry
Among four points of a CAT(0) space, the planar symmetric trapezoids are configurations on which Ptolemy's and Reshetnyak's inequalities are both equalities. We show that the symmetric trapezoids remain extremal for the entire family of inequalities interpolating between the two, indexed by the nond
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