Szukana fraza: [Abstract = A first example of three measures for which their convex combination is equal to their convolution is given. The distributions for which two methods of probabilistic symmetrizations coincide are characterized. The second issue concerns the geometrically infinitely divisible \(GID\) distributions. Such laws appeared as an answer to the question of V. Zolotarev, who asked about distributions satisfying some stability condition. The known GID are, for example, exponential, Laplace, asymmetric Laplace, Mittag\-Leffler, Linnik distributions. We showed that GID distributions are weak limits of the distributions of geometrie random sums.]
