3 citations · 3 across the 6 of their papers we have counts for
6 papers
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…
Pointwise Convergence of Fourier-type Series with Exponential Weights
Hee Sun Jung, Ryozi Sakai
Let , and let be an even function. We consider the exponential weights , $x\in…
-Convergence of higher order Hermite or Hermite-Fejér interpolation polynomials with exponential-type weights
Hee Sun Jung, Ryozi Sakai
Let , and let be an even function, which is an exponent. We consider the weight $…
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…
Higher order derivatives of approximation polynomials on
Hee Sun Jung, Ryozi Sakai
D. Leviatan has investigated the behavior of the higher order derivatives of approximation polynomials of the differentiable function on . Especially, when is the…
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…