2. Ratings
In this article, N denotes an integer greater than or equal to 1, and is the Euclidean N-dimensional space; in practice, we usually have N = 1, 2 or 3, but not necessarily: in relativity, N = 4, and we may have to work in phase spaces with N > 4. The elements of are vectors x = (x 1 , x2 , . . . , xN ). It is convenient to note them as in the case where N = 1; for example, their Euclidean norm will be written with absolute value bars :
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