Abstract
We recall that ℝ is the set of all real numbers. For each x,y in ℝ, let d(x,y) = | x − y |. Thus we have a function d: ℝ × ℝ → ℝ.
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© 1982 Springer-Verlag New York, Inc.
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Moise, E.E. (1982). Metric Spaces. In: Introductory Problem Courses in Analysis and Topology. Universitext. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8183-9_15
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DOI: https://doi.org/10.1007/978-1-4613-8183-9_15
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-90701-7
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