metric space
ematics> A set of points together with a ef="module.php?name=Lexikon&file=search&eid=1&query=function">function, d, called a metric function or distance function. The function assigns a positive ef="module.php?name=Lexikon&file=search&eid=1&query=real number">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) e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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