Mathematics – Probability
Scientific paper
2008-01-28
Mathematics
Probability
Scientific paper
We consider a stochastic control problem where the set of strict (classical) controls is not necessarily convex and the the variable control has two components, the first being absolutely continuous and the second singular. The system is governed by a nonlinear stochastic differential equation, in which the absolutely continuous component of the control enters both the drift and the diffusion coefficients. By introducing a new approach, we establish necessary and sufficient optimality conditions for two models. The first concerns the relaxed-singular controls, who are a pair of processes whose first component is a measure-valued processes. The second is a particular case of the first and relates to strict-singular control problems. These results are given in the form of global stochastic maximum principle by using only the first order expansion and the associated adjoint equation. This improves and generalizes all the previous works on the maximum principle of controlled stochastic differential equations.
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