In this paper, we study the convergence rate of two-dimensional Baskakov operators with Jacobiweights making use of multivariate decompose skills and results of
For given data (ti,yi), I= 0,1,…,n,0 = t0 <t1 <…<tn = 1we study constrained interpolation problem of Favard type inf{‖f'‖∞|f∈W2∞[0,1],f(ti)=yi,i=0,…,n,
A characterization of the convergence domains of polynomial series is disucssed. the minimalconvergence domain for a kind of polynomial series is shown.