Chebyshev 1854: best polynomial approximation p* of f in C[a,b] characterized by equioscillation: f - p* attains +/- |f-p*|_inf at >= n+2 alternating points; Remez algorithm.
Chebyshev 1854: best polynomial approximation p* of f in C[a,b] characterized by equioscillation: f - p* attains +/- |f-p*|_inf at >= n+2 alternating points; Remez algorithm.