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math.CA2014
Inequalities for derivative of polynomial approximation with Erdos type weight
Kentaro Itoh, Ryozi Sakai, Noriaki Suzuki
H. N. Mhaskar obtained the inequalities for derivative of polynomial approximation with Freud type weight. In this paper, we showed the counterpart of the inequalities with Erdos t…
math.CA2014
An estimate for derivative of the de la Vallee Poussin mean
Kentaro Itoh, Ryozi Sakai, Noriaki Suzuki
In this paper, we discuss derivative of the de la Vallee Poussin mean for exponential weights on real line. When we lead an inequality, an estimate for the Christoffel function pla…
math.CA2013★ 3 cited
The de la Vallee Poussin mean and polynomial approximation for exponential weight
K. Itoh, R. Sakai, N. Suzuki
We study the de la Vallee Poussin mean for exponential weights and give a polynomial approximation on real line. H. N. Mhasker proved the corresponding result for Freud-type weight…