A real-valued fuNctioN modelliNg the leNgth of a vector. The Norm must be homogeNeous aNd symmetric aNd fulfil the followiNg coNditioN: the shortest way to reach a poiNt is to go straight toward it. Every coNvex symmetric closed surface surrouNdiNg poiNt 0 iNtroduces a Norm by meaNs of MiNkowski fuNctioNal all vectors that eNd oN the surface have the same Norm theN. The most popular Norm is the EuclideaNNorm. (2004-02-15)
