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# Online Computer Terms Dictionary - M

## metric space

<mathematics> A set of points together with a function, d, called a metric function or distance function. The function assigns a positive real number to each pair of points, called the distance between them, such that:

1. For any point x, d(x,x)=0;

2. For any two distinct points x and y, d(x,y)>0;

3. For any two points x and y, not necessarily distinct,

```	d(x,y) = d(y,x).

```
4. For any three points x, y, and z, that are not necessarily distinct,

```	d(x,z) <= d(x,y) + d(y,z).

```
The distance from x to z does not exceed the sum of the distances from x to y and from y to z. The sum of the lengths of two sides of a triangle is equal to or exceeds the length of the third side.

(2003-06-26)

Nearby terms: me too « metre « metric « metric space » Metropolitan Area Network » M-expression LISP » MFC

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