Mathematics – Probability
Scientific paper
2009-09-18
Mathematics
Probability
6 pages
Scientific paper
We consider the optimal double stopping time problem defined for each stopping time $S$ by $v(S)=\esssup\{E[\psi(\tau_1, \tau_2) | \F_S], \tau_1, \tau_2 \geq S \}$. Following the optimal one stopping time problem, we study the existence of optimal stopping times and give a method to compute them. The key point is the construction of a {\em new reward} $\phi$ such that the value function $v(S)$ satisfies $v(S)=\esssup\{E[\phi(\tau) | \F_S], \tau \geq S \}$. Finally, we give an example of an american option with double exercise time.
Kobylanski Magdalena
Quenez Marie-Claire
Rouy-Mironescu Elisabeth
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