期刊
APPLIED MATHEMATICS AND OPTIMIZATION
卷 48, 期 3, 页码 229-253出版社
SPRINGER
DOI: 10.1007/s00245-003-0776-4
关键词
conditional maximum; ergodic theory; maxingales; optimal stopping; worst case
The conditional supremum of a random variable X on a probability space given a sub-sigma-algebra is defined and proved to exist as an application of the Radon-Nikodym theorem in L-infinity. After developing some of its properties we use it to prove a new ergodic theorem showing that a time maximum is a space maximum. The concept of a maxingale is introduced and used to develop the new theory of optimal stopping in L-infinity and the concept of an absolutely optimal stopping time. Finally, the conditional max is used to reformulate the optimal control of the worst-case value function.
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