S P Tampubolon; D S Palupi. THEORETICAL STUDY OF STOCHASTIC DIFFERENTIAL EQUATIONS AND PROBABILITY DENSITY FUNCTION FOR LINEAR AND NONLINEAR GEOMETRIC BROWNIAN MOTION: KAJIAN TEORITIK PERSAMAAN DIFERENSIAL STOKASTIK DAN PROBABILITY DENSITY FUNCTION BAGI GERAK BROWNIAN GEOMETRIK LINEAR DAN NONLINEAR. PROSIDING SNF 2025, 13, FA-250.