Generalized Transportation Cost Spaces
Mediterranean Journal of Mathematics(2019)
摘要
The paper is devoted to the geometry of transportation cost spaces and their generalizations introduced by Melleray et al. (Fundam Math 199(2):177–194, 2008). Transportation cost spaces are also known as Arens–Eells, Lipschitz-free, or Wasserstein 1 spaces. In this work, the existence of metric spaces with the following properties is proved: (1) uniformly discrete metric spaces such that transportation cost spaces on them do not contain isometric copies of ℓ _1 , this result answers a question raised by Cúth and Johanis (Proc Am Math Soc 145(8):3409–3421, 2017); (2) locally finite metric spaces which admit isometric embeddings only into Banach spaces containing isometric copies of ℓ _1 ; (3) metric spaces for which the double-point norm is not a norm. In addition, it is proved that the double-point norm spaces corresponding to trees are close to ℓ _∞ ^d of the corresponding dimension, and that for all finite metric spaces M , except a very special class, the infimum of all seminorms for which the embedding of M into the corresponding seminormed space is isometric, is not a seminorm.
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关键词
Arens–Eells space,Banach space,distortion of a bilipschitz embedding,Earth mover distance,Kantorovich–Rubinstein distance,Lipschitz-free space,locally finite metric space,transportation cost,Wasserstein distance
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