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- W1559480594 abstract "After summarizing some necessary preliminaries and tools, including Berwald derivative and Lie derivative in pull-back formalism, we present ten equivalent conditions, each of which characterizes Berwald manifolds among Finsler manifolds. These range from Berwald's classical definition to the existence of a torsion-free covariant derivative on the base manifold compatible with the Finsler function and Aikou's characterization of Berwald manifolds. Finally, we study some implications of V. Matveev's observation according to which quadratic convexity may be omitted from the definition of a Berwald manifold. These include, among others, a generalization of Z. I. Szab'o's well-known metrization theorem, and leads also to a natural generalization of Berwald manifolds, to Berwald--Matveev manifolds." @default.
- W1559480594 created "2016-06-24" @default.
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- W1559480594 date "2011-06-11" @default.
- W1559480594 modified "2023-10-17" @default.
- W1559480594 title "Ten ways to Berwald manifolds -- and some steps beyond" @default.
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- W1559480594 doi "https://doi.org/10.48550/arxiv.1106.2223" @default.
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