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arXiv 2407.06243math.OCmath.PR
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基于非光滑函数链式法则的零和随机微分博弈相关的验证定理

Verification theorem related to a zero sum stochastic differential game, based on a chain rule for non-smooth functions

Carlo Ciccarella, Francesco Russo

AI总结:

本文在随机零和微分博弈框架下,基于非光滑函数链式法则建立验证定理,证明在非退化扩散及Isaacs条件下反馈控制可构成Nash均衡鞍点,并推广至退化情形,同时改进了随机控制中的经典验证定理。

摘要:

在随机零和微分博弈的框架下,我们建立了一个验证定理,受随机控制中已有定理的启发,为一对反馈控制构成 Nash 均衡提供充分条件。假设经典 Isaacs 条件成立,且 Bellman-Isaacs (BI) 方程存在(所谓的)拟强解。如果状态方程的扩散系数是非退化的,我们能够证明存在由一对反馈控制构成的鞍点,这些反馈控制实现了博弈的值:此外,该博弈值等于 BI 方程的(必然唯一的)解。当扩散可能退化时,也有合适的推广可用。类似地,我们还改进了随机控制理论中一个著名的验证定理。我们使用的通过正则化进行随机微分的技巧,特别是特定的链式法则,借鉴自作者的一篇配套论文。

英文摘要:

In the framework of stochastic zero-sum differential games, we establish a verification theorem, inspired by those existing in stochastic control, to provide sufficient conditions for a pair of feedback controls to form a Nash equilibrium. Suppose the validity of the classical Isaacs' condition and the existence of a (what is termed) quasi-strong solution to the Bellman-Isaacs (BI) equations. If the diffusion coefficient of the state equation is non-degenerate, we are able to show the existence of a saddle point constituted by a couple of feedback controls that achieve the value of the game: moreover, the latter is equal to the (necessarily unique) solution of the BI equations. A suitable generalization is available when the diffusion is possibly degenerate. Similarly we have also improved a well-known verification theorem in stochastic control theory. The techniques of stochastic calculus via regularization we use, in particular specific chain rules, are borrowed from a companion paper of the authors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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