Nearby linear Chebyshev approximation under constraints
It is shown that if f is near g, the linear family L is near the linear family L', the domain X is near the domain Y, and the constraint set C is near the constraint set C', a best Chebyshev approximation to f from L on X under the constraints C is near a best Chebyshev approximation to g from L' on Y, under the constraints C'.
scientific article; zbMATH DE number 3867928