A mathematical entity that gives a measure of distance in space or, in relativity theory, space–time. In the case of curved space–time, as needed in the general theory of relativity, the metric is a more complicated entity than the metrics for ordinary Euclidean space and Minkowski space.
The non-negative function d used to define a distance between two points in constructing a metric space, with the following properties:
for any points x, y, z.
See also norm, pseudometric, quasi-metric, semi-metric, ultrametric.
See distance measure.
1. A number representing the degree to which software, or an entity related to software, possesses some notional property, as observed or perceived by an individual or group.
2. Informal name for measure.
3. A specific type of mapping in which the codomain is a number, and the triangle inequality applies.
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