Qingying Xue

collaborators

2 papers

math.CA2011

Weighted Estimates for the iterated Commutators of Multilinear Maximal and Fractional Type Operators

Qingying Xue

In this paper, the following iterated commutators $T_{*, Π b}$ of maximal operator for multilinear singular integral operators and $I_{α, Π b}$ of multilinear fractional integral oper…

math.CA2010

Smoothness of Extremizers of a Convolution Inequality

Michael Christ, Qingying Xue

Let $d \geq 2$ and $T$ be the convolution operator $T f (x) = \int_{R^{d - 1}} f (x^{'} - t, x_{d} - ∣ t ∣^{2}) d t$ , which is is bounded from $L^{(d + 1) / d} (R^{d})$ to $L^{d + 1} (R^{d})$ . We show…