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By Amarjit Budhiraja, Paul Dupuis (auth.), William M. McEneaney, G. George Yin, Qing Zhang (eds.)

In view of Professor Wendell Fleming's many basic contributions, his profound impact at the mathematical and platforms idea communi­ ties, his provider to the occupation, and his commitment to arithmetic, we now have invited a couple of top specialists within the fields of keep an eye on, optimiza­ tion, and stochastic platforms to give a contribution to this quantity in his honor at the social gathering of his seventieth birthday. those papers specialise in numerous features of stochastic research, regulate idea and optimization, and purposes. They contain authoritative expositions and surveys in addition to examine papers on fresh and critical concerns. The papers are grouped in accordance with the next 4 significant topics: (1) huge deviations, possibility delicate and Hoc keep watch over, (2) partial differential equations and viscosity strategies, (3) stochastic keep an eye on, filtering and parameter esti­ mation, and (4) mathematical finance and different purposes. We convey our deep gratitude to the entire authors for his or her important contributions, and to the referees for his or her cautious and well timed stories. We thank Harold Kushner for having graciously agreed to adopt the duty of writing the foreword. specific thank you visit H. Thomas Banks for his support, recommendation and recommendations throughout the complete instruction strategy, in addition to for the beneficiant aid of the guts for study in clinical Computation. the help from the Birkhauser expert employees can also be drastically appreciated.

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Define L(t) = E(~lg,). Clearly (L(t),gt)oStST is a right continuous martingale bounded above and below by e211Jlloo and e-2l1Jlloo respectively. 2 that there exists u E A W such that for all 0 ~ t ~ T 1t = + 1t L(t) = 1 + (u(s), dW(s)). We can rewrite the last equality as L(t) (v(s)L(s), dW(s)), 1 where vet) == u(t)j L(t). 4]) that L(t) = exp (I t(v(s), dW(s)) - 41t IIv(s)lI~dS) . 1 that under 'Yo W == W -1· v(s)ds is a Brownian motion with covariance Q. Therefore -logEexp{ - feW)} = Eti (41 T IIv(s)lI~ds + f (w + i· V(S)dS) ) .

The partially-observed MDP setting has been studied in [BJam), where an information state and dynamic programming equations for the value function on the finite horizon are introduced. Structural results for the value function are due to [FGMar]. Early work in minimax control of stochastic systems includes [BR71], where the connection between stochastic and deterministic descriptions of uncertainty is addressed. In the LQG setting, a connection between risk-sensitive control and Hoo control is established in [GD88].

It can further be shown that policy and value iteration techniques can be used to synthesize an optimal policy. See [Cor97] for details, and for extensions to the partial state observations setting. The nature of the discount factors {3, {3', and {3" can be better understood by considering the small-risk limit, '}'--+ 0, of (39). We obtain the following: h~(i) = min{{3kc(i, u) + {3' {3"" P;j(U)h~+l(j)}, k = 0,.... uEU ~ j (40) 30 Stefano P. Coraluppi, Steven I. Marcus Note that this optimality equation is more general than the risk-neutral dynamic programming equation.

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