function-approximation 4 Why TD Learning Likes the 2-Norm: Mean Directions, Inner Products, and Bellman Geometry Jun 13, 2026 Linear TD vs Neural TD: A Tale of Two Geometries Jun 12, 2026 Why Do Neural TD Converge ? Jun 2, 2026 Function Approximation in RL: From Tables to Linear Models to Neural Networks May 27, 2026