Introduction 1The Movement of Charged Particles in an Electric Field . 3Two-dimensional Problem of the Behavior of a Cloud ofCharged Particles in a Magnetron 6Investigation of the Particle-in-Cell Method 17 Some Questions in the Calculation of the Evolution of Stars 51 Translation of ’’Resheniye Zadach Metodom Krupnykh Chastits *’ Transactions of the Computer Center, Academy of Sciences, USSRMoscow, 1970