Zero-sum and nonzero-sum differential games without Isaacs condition

In this paper we study the zero-sum and nonzero-sum differential games with not assuming Isaacs condition. Along with the partition $π$ of the time interval $[0,T]$, we choose the suitable random non-anticipative strategy with delay to study our differential games with asymmetric information. Using Fenchel transformation, we prove that the limits of the upper value function $W^π$ and lower value function $V^π$ coincide when the mesh of partition $π$ tends to 0. Moreover, we give a characterization for the Nash equilibrium payoff (NEP, for short) of our nonzero-sum differential games without Isaacs condition, then we prove the existence of the NEP of our games. Finally, by considering all the strategies along with all partitions, we give a new characterization for the value of our zero-sum differential game with asymmetric information under some equivalent Isaacs condition.

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