TY - JOUR
T1 - Weighted Approximation by Left Quasi-Interpolants of Derivatives of Gamma Operators
AU - Jiang , Hongbiao
JO - Communications in Mathematical Research 
VL - 4
SP - 289
EP - 298
PY - 2021
DA - 2021/07
SN - 25
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/cmr/19347.html
KW - Gamma operator, quasi-interpolant, weighted approximation, modulus of smoothness,
derivative.
AB - <p style="text-align: justify;">In order to obtain much faster convergence, Müller introduced the left Gamma quasi-interpolants and obtained an approximation equivalence theorem in terms of $ω^{2r}_φ(f, t)_p$. Guo
extended the Müller&#39;s results to $ω^{2r}_{φ^λ} (f, t)_∞$. In this paper we improve the previous results and give
a weighted approximation equivalence theorem.</p>