2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95501This paper is devoted to the study of the following problem. We have set of diffusion processes with absorption on boundaries in some region at initial time $t=0$. It is required to estimate of number of the unabsorbed processes for the fixed time ~$τ>0$. The number of initial processes is considered as function of $τ$ and $τ\to\infty$.11 pagesProbability60 J 60text