Abstract:
We obtain an estimate of the norm of the Lagrange interpolation operator in a multidimensional Sobolev space. It is shown that, under a suitable choice of the sequence of multi-indices, interpolation polynomials converge to the interpolated function and their rate of convergence is of the order of the best approximation of this function.
Keywords:
Lagrange interpolation operator, interpolation polynomial, rate of convergence, best approximation, Sobolev space, Hilbert space.
Citation:
A. I. Fedotov, “Estimate of the Norm of the Lagrange Interpolation Operator in a Multidimensional Sobolev Space”, Mat. Zametki, 81:3 (2007), 427–433; Math. Notes, 81:3 (2007), 373–378