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### Why does the state-action value function, defined as an expected value of the reward and state value function, not need to follow a policy?

Let's first write the state-value function as $$q_{\pi}(s,a) = \mathbb{E}_{p, \pi}[R_{t+1} + \gamma G_{t+1} | S_t = s, A_t = a]\;,$$ where $R_{t+1}$ is the random variable that represents the reward ...
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