Metric Space

D x y 0 if x y and d x y 1 otherwise.
Metric space. The discrete metric on the x is given by. The positive real numbers with distance function d x y log y x displaystyle d x y vert log. G x y 0 iff x y 2. Then this does define a metric in which no distinct pair of points are close.
A metric space must also satisfy 1. A metric space is a set equipped with a distance function which provides a measure of distance between any two points in the set. Metrics on spaces of functions. The function needs to be symmetric.
Any normed vector space is a. One represents a metric space s s with metric. A metric space is said to be complete if every sequence of points in which the terms are eventually pairwise arbitrarily close to each other a so called cauchy sequence converges to a point in the metric space. Examples of metric spaces the real numbers with the distance function d x y y x displaystyle d x y vert y x vert given by the.
D x y d y x. The distance function known as a metric must satisfy a collection of axioms. The fact that every pair is spread out is why this metric is called discrete.