The Functional Equations of Undiscounted Markov Renewal Programming

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Abstract
This paper investigates the solutions to the functional equations that arise inter alia in Undiscounted Markov Renewal Programming. We show that the solution set is a connected, though possibily nonconvex set whose members are unique up to n* constants, characterize n* and show that some of these n* degrees of freedom are locally rather than globally independent. Our results generalize those obtained in Romanovsky (Romanovsky, I. 1973. On the solvability of Bellman's functional equation for a Markovian decision process. J. Math. Anal. Appl. 42 485–498.) where another approach is followed for a special class of discrete time Markov Decision Processes. Basically our methods involve the set of randomized policies. We first study the sets of pure and randomized maximal-gain policies, as well as the set of states that are recurrent under some maximal-gain policy.

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