11.21 Log-Chebyshev approximation with bounds. We consider an approximation problem: find x ∈ Rn, that satisfies the variable bounds l x u, and yields Ax ≈ b, where b ∈ Rm. You can assume that l u, and b 0 (for reasons we explain below). We let denote the ith row of the matrix A.
We judge the approximation Ax ≈ b by the