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Research · 1957

Dynamic Programming

Bellman stated the principle of optimality: an optimal solution is made of optimal solutions for the rest of the path.

Why it matters

Sequential decision problems acquired the decomposition that state-value estimation in reinforcement learning is built on.

The book also introduces the phrase curse of dimensionality for the growth of computation with the number of state variables. The Bellman equation later became the basis of temporal-difference methods; Samuel's checkers program used that kind of update, without the name. The principle itself is older than the book: Bellman states it in RAND paper P-550, dated 30 July 1954, the text of an address to the American Mathematical Society on 2 September 1954 (whatever the initial state and the first decisions, the remaining decisions must form an optimal policy for the state that results). Stuart Dreyfus, in his introduction to the 2010 edition, calls the curse of dimensionality Bellman's phrase and writes that temporal-difference learning, which approximates the optimal value function from observation, was, as far as he knows, never contemplated by Bellman; he does not say that the phrase first appears in this book.

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1957
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Sources gathered automatically · September 17, 2026
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Year of the book.

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