Abstract
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 \(\ell _1\), 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 \(\ell _1\); (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 \(\ell _\infty ^d\) 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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Acknowledgements
The second-named author gratefully acknowledges the support by National Science Foundation Grant NSF DMS-1700176. We would like to thank the referee for the valuable suggestions and corrections.
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Ostrovska, S., Ostrovskii, M.I. Generalized Transportation Cost Spaces. Mediterr. J. Math. 16, 157 (2019). https://doi.org/10.1007/s00009-019-1433-8
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DOI: https://doi.org/10.1007/s00009-019-1433-8
Keywords
- 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