It is well known that colloidal suspensions are of great interest for their technological applications and in order to understand their properties it is necessary to use a statistical description. The latter is considered a difficult task. However, practical applications should not be the only reason for such an interest. As has already been pointed out, many phenomena of interest for statistical physics which are unobservable in atomic systems can be observed in colloidal suspensions due to much longer time and length scales. That is an important experimental aspect of suspensions. There is also an equally important theoretical one which we would like to discuss in this short paper.
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