@Article{Idczak2016, author = "Idczak, Dariusz and Walczak, Stanislaw", title = "On a linear-quadratic problem with Caputo derivative", journal = "Opuscula Math.", year = "2016", volume = "36", number = "1", pages = "49--68", doi = "http://dx.doi.org/10.7494/OpMath.2016.36.1.49", url = "http://dx.doi.org/10.7494/OpMath.2016.36.1.49", abstract = "In this paper, we study a linear-quadratic optimal control problem with a fractional control system containing a Caputo derivative of unknown function. First, we derive the formulas for the differential and gradient of the cost functional under given constraints. Next, we prove an existence result and derive a maximum principle. Finally, we describe the gradient and projection of the gradient methods for the problem under consideration.", keywords = "fractional Caputo derivative, linear-quadratic problem, existence and uniqueness of a solution, maximum principle, gradient method, projection of the gradient method", issn = "1232-9274" }