إيمان فريج فراج الجهني2022-05-192022-05-191144https://drepo.sdl.edu.sa/handle/20.500.14154/10363In this thesis we present some results in the area of calculus of variations concerning to the characterization of the minimizing element of some quadratic functionals with application in the areasof optimal control theory concerning elliptic and parabolic infinite order partial differential systems with boundary Dirichlet conditions.ar-SAThesis