: Mathématiques: metric space

geometry > topological space > metric space

metric space

In mathematics, a metric space is a set together with a notion of distance between its elements, usually called points. The distance is measured by a function called a metric or distance function. Metric spaces are the most general setting for studying many of the concepts of mathematical analysis and geometry.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Metric_space)

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