Abstract
The local structure of Finsler metrics of constant flag curvature have been historically mysterious. It is proved that every Matsumoto metric of constant flag curvature on a closed n-dimensional manifold of dimension n ≥ 3 is either Riemannian or locally Minkowskian.
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Rafie-Rad, M., Rezaei, B. Matsumoto Metrics of Constant Flag Curvature: A Puny Class of Finsler Metrics with Constant Curvature. Results. Math. 63, 475–483 (2013). https://doi.org/10.1007/s00025-011-0210-1
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DOI: https://doi.org/10.1007/s00025-011-0210-1