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Metric   (English)

Definition Niveau 4

Any kind of 'distance' function d(x,y) that takes two position vectors and gives a single number with the following properties:
d(x,y)=0 if and only if x = y;
d(x,y)=d(y,x);
d(x,y) + d(y,z) ≥ d(x,z) (the Triangle Inequality).

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