the function

approximation problem was chosen as an aim of the experiment.

It seems that combining the two strategies is a good way to deal with the

approximation problem.

n](x) of degree at most n, and the

approximation problem can be represented to minimize the error (E):

34] investigated a rational

approximation problem in connection with the convergence analysis of the ADI iterative method applied to the Stein matrix equation.

This problem is so-called the optimal

approximation problem with respect to matrix equation (2) (see e.

The function

approximation problem can be stated formally as follows [5].

Special topics include simple C*-algebras, approximation properties for groups, the weak expectation property and local lifting property, weakly exact von Neumann algebras, and such applications as Herrero's

approximation problem and classification of von Neumann algebras.

The weighted

approximation problem is to find a matrix B [element of] [R.

The optimal

approximation Problem II occurs frequently in experimental design, see for instance [13, 14].

k)](A) that solves the ideal GMRES

approximation problem (1.

t](z) = [-1, a(z)], the Pade-Hermite and the simultaneous Pade

approximation problems each become the classical Pade

approximation problem for a(z).

Problem II is the optimal

approximation problem, which occurs frequently in experimental design [18].