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Article

Hafayed, Mokhtar ; Veverka, Petr ; Abbas, Syed
On near-optimal necessary and sufficient conditions for forward-backward stochastic systems with jumps, with applications to finance. (English). Applications of Mathematics, vol. 59 (2014), issue 4, pp. 407-440
MSC: 49K45, 60H10, 60J75, 91G10, 93E20 | MR 3233552 | Zbl 06362236 | DOI: 10.1007/s10492-014-0064-4
Keywords:
stochastic near-optimal controls; jump processes; forward-backward stochastic systems with jumps; necessary and sufficient conditions for near-optimality; Ekeland's variational principle
Summary:
We establish necessary and sufficient conditions of near-optimality for nonlinear systems governed by forward-backward stochastic differential equations with controlled jump processes (FBSDEJs in short). The set of controls under consideration is necessarily convex. The proof of our result is based on Ekeland's variational principle and continuity in some sense of the state and adjoint processes with respect to the control variable. We prove that under an additional hypothesis, the near-maximum condition on the Hamiltonian function is a sufficient condition for near-optimality. At the end, as an application to finance, mean-variance portfolio selection mixed with a recursive utility optimization problem is given.
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