Robust control — H∞ synthesis (mixed sensitivity, S/KS/T weighting), μ-synthesis (structured singular value, D-K iteration), loop shaping (Glover-McFarlane), uncertainty modeling (additive, multiplicative, structured, parametric), robust stability condition (small gain theorem), robust performance, LFT (Linear Fractional Transformation) framework, coprime factorization, MATLAB Robust Control Toolbox, and aerospace/process control applications.