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A setV ofn points ink-dimensional space induces a complete weighted undirected graph as follows. The points are the vertices of this graph and the weight of an edge between any two points is the distance between the points under someL p metric. Let ε≤1 be an error parameter and letk be fixed. We show how to extract inO(n logn+ε −k  log(1/ε)n) time a sparse subgraphG=(V, E) of the complete graph onV such that: (a) for any two pointsx, y inV, the length of the shortest path inG betweenx andy is at most (1+∈) times the distance betweenx andy, and (b)|E|=O(ε−k n).

A sparse graph almost as good as the complete graph on points inK dimensions