Cs> 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 symmetriCClosed 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 EuClidean norm. (2004-02-15)
