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This lecture covers the proof of the recursive formula for the optimal gains in LQ control over a finite horizon. It explains the solution to the FH-LQ problem, the stability of the closed-loop system, and the state-feedback regulator. The lecture also delves into the minimization of quadratic forms and the dynamic programming argument used in the computation of the cost-to-go. The Difference Riccati Equation (DRE) and the backward iterations for computing the optimal control law are discussed in detail.