Some Remarks on Rational Müntz Approximation on [0,∞)
On approximation by Lagrange interpolating polynomials for a subset of the space of continuous functions
We construct a piecewise differentiable function that is not piecewise analytic and satisfies a Jackson type estimate for approximation by Lagrange interpolating polynomials associated with the extremal points of the Chebyshev polynomials.
On Müntz rational approximation in multivariables
The present paper shows that for any sequences of real numbers, each with infinitely many distinct elements, , j=1,...,s, the rational combinations of are always dense in .
A note on lacunary approximation on [-1,1]
The divergence phenomena of interpolation type operators in space
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