collaborators

6 papers

math.OC2026

On the Strong Duality in Continuous-time and Discrete-time Linear Quadratic Regulators

Yuto Watanabe, Yang Zheng

This paper revisits the strong duality in the linear quadratic regulator (LQR) for continuous-time and discrete-time systems, and explores its interconnection with typical assumpti…

math.OC2026

Policy Optimization of Mixed H2/H-infinity Control: Benign Nonconvexity and Global Optimality

Chih-Fan Pai, Yuto Watanabe, Yujie Tang +1

Mixed H2/H-infinity control balances performance and robustness by minimizing an H2 cost bound subject to an H-infinity constraint. However, classical Riccati/LMI solutions offer l…

math.OC2026

Gradient Dominance in the Linear Quadratic Regulator: A Unified Analysis for Continuous-Time and Discrete-Time Systems

Yuto Watanabe, Yang Zheng

Despite its nonconvexity, policy optimization for the Linear Quadratic Regulator (LQR) admits a favorable structural property known as gradient dominance, which facilitates linear…

math.OC2025

Policy Optimization in Robust Control: Weak Convexity and Subgradient Methods

Yuto Watanabe, Feng-Yi Liao, Yang Zheng

Robust control seeks stabilizing policies that perform reliably under adversarial disturbances, with control as a classical formulation. It is known that polic…

math.OC2025

Semidefinite Programming Duality in Infinite-Horizon Linear Quadratic Differential Games

Yuto Watanabe, Chih-Fan Pai, Yang Zheng

Semidefinite programs (SDPs) play a crucial role in control theory, traditionally as a computational tool. Beyond computation, the duality theory in convex optimization also provid…

math.OC2025

Revisiting Strong Duality, Hidden Convexity, and Gradient Dominance in the Linear Quadratic Regulator

Yuto Watanabe, Yang Zheng

The Linear Quadratic Regulator (LQR) is a cornerstone of optimal control theory, widely studied in both model-based and model-free approaches. Despite its well-established nature,…