2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222370Let $X$ be a random vector in $\rd$ with a regularly varying tail. We consider two transformations $\|X\|f(\frac{X}{\|X\|})$, $f: \sd\to\sd$, and $Xf(\frac{X}{\|X\|})$, $f: \sd\to \mathbb{R}_+$. Some sufficient conditions for preserving the property of regularity of the tail for this kind of transformations are given.11 pagesProbability60B10, 60E05, 60E07, 60F05.text