For a long period of time, the probability theory was meant to interpret the laws of averages but even within this theory occurrences now associated with extreme values had been viewed as accidents or surprises without regular laws. This view has changed only quite recently, and in this work we deal with some of the present stage problems of extreme value theory from the mathematical and practical points of view. The main aim of this work is to study the limiting behavior of the random maximum of np-dimensional distributed random variables, which are non-identical. The results of this study...