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General Definitions

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Abstract

Let X be a set. A function d:X×X→ℝ is called a distance (or dissimilarity) on X if, for all x,yX, there holds:

  1. 1.

    d(x,y)≥0 (nonnegativity);

  2. 2.

    d(x,y)=d(y,x) (symmetry);

  3. 3.

    d(x,x)=0 (reflexivity).

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Deza, M.M., Deza, E. (2013). General Definitions. In: Encyclopedia of Distances. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30958-8_1

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