Abstract
The recent literature contains several papers which explore mathematical programming formulations of particular Markov sequential decision problems. Each of these papers deals with finite state and action spaces; thus, the corresponding programming formulations yield dual finite linear programs. In this paper these investigations are extended to include countable action and/or state spaces for finite horison problems. Of particular interest are the duality aspects of the mathematical programming formulations. In addition, employing conditions analogous to fundamental concepts of Haar semi-infinite dual programming, we provide sufficient conditions for the existence of optimal rules for countable action spaces. Guided by the semi-infinite duality theory we explore mathematical programming formulations for two cases: 1) Countable action space and finite state space—the result is a pair of dual semi-infinite programs; and 2) Finite action space and countable state space—we obtain a pair of infinite programs. In the latter case we show that no duality gap occurs and obtain duality results comparable to those of finite linear programming.
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