2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39666This talk at Fradkin conference is devoted to brief description of latest results in two topics I worked on during last years. The multiresolution analysis and fast wavelet transform became a standard procedure for pattern recognition and I describe how it has been used for analysis of high energy nucleus-nucleus interactions. Latest QCD results on multiplicities in quark and gluon jets are discussed and confronted to experimental data.10 pages, LATEX, no Figs; talk given at memorial Fradkin conference, 9 June 2000High Energy Physics - Phenomenologytext