The Bellman equation is a fundamental recursive relationship used in dynamic programming and optimal control that expresses the value of a decision at one point in time as the sum of immediate rewards and the expected value of future decisions. It is crucial for solving problems where decisions need to be made sequentially over time, particularly in uncertain environments where future states depend on current choices. This equation lays the groundwork for various methods to find optimal policies and value functions, ultimately aiding in decision-making under uncertainty.
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