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arXiv 1605.04520math.OC
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零和对策遍历问题的增生算子方法

An Accretive Operator Approach to Ergodic Problems for Zero-Sum Games

Antoine Hochart

摘要:

平均支付随机对策可以通过涉及Shapley算子的非线性谱问题:遍历方程来研究。解包含一个标量(称为遍历常数)和一个向量(称为偏置)。这样一对的存在意味着每单位时间的平均收益等于任何初态的遍历常数,并且偏差给出了稳定的策略。利用Shapley算子的两个基本性质,单调性和可加齐次性,给出了有限状态空间的随机对策的转移支付扰动所得到的所有Shapley算子的遍历方程可解的一个充要条件.如果后一个条件得到满足,我们建立的偏见是唯一的(添加剂常数)的一般扰动的过渡支付。为了证明这些结果,我们利用增生算子的理论,特别证明了一些满射性条件。

英文摘要:

Mean payoff stochastic games can be studied by means of a nonlinear spectral problem involving the Shapley operator: the ergodic equation. A solution consists in a scalar, called the ergodic constant, and a vector, called bias. The existence of such a pair entails that the mean payoff per time unit is equal to the ergodic constant for any initial state, and the bias gives stationary strategies. By exploiting two fundamental properties of Shapley operators, monotonicity and additive homogeneity, we give a necessary and sufficient condition for the solvability of the ergodic equation for all the Shapley operators obtained by perturbation of the transition payments of a given stochastic game with finite state space. If the latter condition is satisfied, we establish that the bias is unique (up to an additive constant) for a generic perturbation of the transition payments. To show these results, we use the theory of accretive operators, and prove in particular some surjectivity condition.

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