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arXiv 2005.11701math.OC
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两人零和随机线性二次微分对策

Two-Person Zero-Sum Stochastic Linear-Quadratic Differential Games

Jingrui Sun

摘要:

研究了确定性系数的二人零和随机线性二次(简称LQ)微分对策的开环鞍点和开环上下限,以及它们之间的关系.得到了开环上下限值有限的必要条件和开环鞍点存在的充分条件。证明了在该充分条件下,对应的Riccati方程存在唯一的强正则解,并据此建立了开环鞍点的闭环表示.给出的例子表明,开环上限值和下限值的有限性并不能保证开环鞍点的存在。但对于经典的确定性LQ对策,这两个问题是等价的,都意味着Riccati方程的可解性,并获得了一个明确的表示的解决方案。

英文摘要:

The paper studies the open-loop saddle point and the open-loop lower and upper values, as well as their relationship for two-person zero-sum stochastic linear-quadratic (LQ, for short) differential games with deterministic coefficients. It derives a necessary condition for the finiteness of the open-loop lower and upper values and a sufficient condition for the existence of an open-loop saddle point. It turns out that under the sufficient condition, a strongly regular solution to the associated Riccati equation uniquely exists, in terms of which a closed-loop representation is further established for the open-loop saddle point. Examples are presented to show that the finiteness of the open-loop lower and upper values does not ensure the existence of an open-loop saddle point in general. But for the classical deterministic LQ game, these two issues are equivalent and both imply the solvability of the Riccati equation, for which an explicit representation of the solution is obtained.

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