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Bonsangue, M.M.; Van
Breugel, F.; Rutten, J.J.M.M. (1998). "Generalized metric spaces: Completion, topology, and powerdomains via the Yoneda embedding".
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namely, the property that distinct elements have nonzero distance between them and the property that the distance between two elements is always finite.
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Lawvere, F. William (1973). "Metric spaces, generalized logic, and closed categories".
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