2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148467The purpose of these lectures is to give a short introduction into a very vast field of numerical simulations for cosmological applications. I focus on major features of the simulations: the equations, main numerical techniques, effects of resolution, and methods of halo identification.16 pages TEX. 9 PostScript figures and the text are available at ftp://charon.nmsu.edu/pub/aklypin/LECTURE1 To appear in International School of Physics ``Enrico Fermi'': Dark Matter in the Universe,Varenna 1995, eds. S. Bonometto, J.R. Primack, A. Provenzale. Corrected ftp addressAstrophysicstext